1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
#define _USE_MATH_DEFINES
//#pragma GCC optimize("O3")
// #pragma GCC target("sse4")

#include <bits/stdc++.h>
using namespace std;

#define LSB(i) ((i) & -(i)) // zeroes all the bits except the least significant one

#define OPEN(a) freopen(a, "r", stdin)
#define F first
#define S second
#define PB push_back
#define BOOST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ALL(i) begin((i)), end((i))
#define SZ(i) ((int)i.size())
#define SORT(a) sort(ALL(a))

using LL = long long;
using LD = long double;
using PII = pair<int, int>;
using PLL = pair<LL, LL>;
using PLD = pair<LD, LD>;
using VI = vector<int>;
using VLL = vector<LL>;
using VLD = vector<LD>;
using VPII = vector<PII>;
using VPLL = vector<PLL>;
using VPLD = vector<PLD>;
using VVI = vector<VI>;

#define GET_MACRO(_1, _2, _3, _4, NAME, ...) NAME
#define __FOR3(i, a, n, inc) for(int i = (a); (inc) > 0 ? i < (n) : i >= (n); i += (inc))
#define __FOR2(i, a, n) __FOR3(i, a, n, 1)
#define __FOR1(i, n) __FOR2(i, 0, n)
#define FOR(...) GET_MACRO(__VA_ARGS__, __FOR3, __FOR2, __FOR1)(__VA_ARGS__)

#define REV(a,b) for(int a= b; a >= 0; --a)
#define FRU(a,b) for(const auto& a: b)
#define FRUM(a,b) for(auto& a : b)

const int inf = 1e9 + 7;
const int MOD = 998244353;
const LL INF = 1e18 + 7;
const long double PI = acos(-1);
const LD EPS = 1e-9;


namespace input {
    template< class T> istream& operator>>(istream& st, vector<T> & container) { for (auto& u : container) st >> u; return st; }
    template< class T, size_t N> istream& operator>>(istream& st, array<T, N> & container) { for (auto& u : container) st >> u; return st; }
    template <class T, class U> istream& operator>>(istream& st, pair<T, U> & p) { st >> p.first >> p.second; return st; }

    void re() {}
    template<typename T, typename... TArgs> void re(T& x, TArgs&... rest) { cin >> x; re(rest...); };
}
using namespace input;



#define RE(...)   int __VA_ARGS__; re(__VA_ARGS__);
#define RELL(...) LL __VA_ARGS__; re(__VA_ARGS__);
#define RELD(...) LD __VA_ARGS__; re(__VA_ARGS__);


namespace output
{
    template< class T> ostream& operator<<(ostream& st, const vector<T> & container) { for (auto& u : container) st << u << ' '; return st; }
    template< class T, size_t N> ostream& operator<<(ostream& st, const array<T, N> & container) { for (auto& u : container) st << u << ' '; return st; }
    template <class T, class U> ostream& operator<<(ostream& st, pair<T, U> p) { st << p.first << ' ' << p.second; return st; }

    void pr() {}
    template <typename T> void pr(const T& x) { cout << x; }
    template <typename T, typename... TArgs> void pr(const T& x, const TArgs&... rest) { cout << x << ' '; pr(rest...); }
    template <typename... TArgs> void prln(const TArgs&... args) { pr(args...); cout << '\n'; }
}
using namespace output;

namespace pairs
{
    template<class T, class U, class V> pair<T, U> operator* (pair<T, U>p, V val) { return{ p.first * val, p.second * val }; }
    template<class T, class U, class V> pair<T, U> operator/ (pair<T, U>p, V val) { return{ p.first / val, p.second / val }; }
    template<class T, class U>  pair<T, U> operator- (pair<T, U> a, pair<T, U> b) { return{ a.first - b.first, a.second - b.second }; }
    template<class T, class U>  pair<T, U> operator+ (pair<T, U> a, pair<T, U> b) { return{ a.first + b.first, a.second + b.second }; }
}
using namespace pairs;

namespace triples
{
#define TT1T2T3 template<class T1, class T2, class T3>
#define TT1T2T3T4 template<class T1, class T2, class T3, class T4>
#define TRT1T2T3  triple<T1, T2, T3>
    TT1T2T3 struct triple { T1 x; T2 y; T3 z; triple() : x(T1()), y(T2()), z(T3()) {}; triple(T1 _x, T2 _y, T3 _z) :x(_x), y(_y), z(_z) {} };
    TT1T2T3 bool operator<(const TRT1T2T3&t1, const TRT1T2T3&t2) { if (t1.x != t2.x)return t1.x < t2.x; if (t1.y != t2.y) return t1.y < t2.y; else return t1.z < t2.z; }
    TT1T2T3 bool operator>(const TRT1T2T3&t1, const TRT1T2T3&t2) { if (t1.x != t2.x)return t1.x > t2.x; if (t1.y != t2.y) return t1.y > t2.y; else return t1.z > t2.z; }
    TT1T2T3 bool operator==(const TRT1T2T3&t1, const TRT1T2T3&t2) { return (t1.x == t2.x && t1.y == t2.y && t1.z == t2.z); }
    TT1T2T3 inline istream& operator >> (istream& os, triple<T1, T2, T3>& t) { return os >> t.x >> t.y >> t.y; }
    TT1T2T3 ostream& operator << (ostream& os, const triple<T1, T2, T3>& t) { return os << t.x << " " << t.y << " " << t.z; }

    TT1T2T3 TRT1T2T3 operator+(TRT1T2T3 a, TRT1T2T3 b) { return { a.x + b.x, a.y + b.y, a.z + b.z }; }
    TT1T2T3 TRT1T2T3 operator-(TRT1T2T3 a, TRT1T2T3 b) { return { a.x - b.x, a.y - b.y, a.z - b.z }; }
    TT1T2T3T4 TRT1T2T3 operator*(TRT1T2T3 a, T4 val) { return { a.x * val, a.y * val, a.z * val }; }
    TT1T2T3T4 TRT1T2T3 operator/(TRT1T2T3 a, T4 val) { return { a.x / val, a.y / val, a.z / val }; }

#undef TT1T2T3T4
#undef TRT1T2T3
#undef TT1T2T3
    using TRII = triple<int, int, int>;
    using TRLL = triple<LL, LL, LL>;
    using TRLD = triple<LD, LD, LD>;
    using VTRII = vector<TRII>;
    using VTRLL = vector<TRLL>;
    using VTRLD = vector<TRLD>;
}
using namespace triples;

namespace geo
{
    template<class T> T dotProduct(pair<T, T> a, pair<T, T> b) { return a.first*b.first + a.second* b.second; }
    template<class T> T crossProduct(pair<T, T>a, pair<T, T> b) { return a.first * b.second - a.second * b.first; }
    template<class T> T lengthPow(pair<T, T> a) { return a.first*1ll*a.first + a.second*1ll*a.second; }
    template<class T> LD length(pair<T, T> a) { return sqrt(lengthPow(a)); }


    template<class T> T dotProduct(triple<T, T, T> a, triple<T, T, T> b) { return a.x*b.x + a.y* b.y + a.z*b.z; }
    template<class T> T crossProduct(triple<T, T, T> a, triple<T, T, T> b) { return { a.y*b.z - a.z*b.y, a.z*b.x - a.x*b.z, a.x*b.y - a.y*b.x }; }
    template<class T> T lengthPow(triple<T, T, T> a) { return a.x*1ll*a.x + a.y*1ll*a.y + a.z*1ll*a.z; }
    template<class T> LD length(triple<T, T, T> a) { return sqrt(lengthPow(a)); }
}
using namespace geo;

template <class T> T invGeneral(T a, T b) { // 0 < a < b, gcd(a,b) = 1
    a %= b;
    if (a == 0) return b == 1 ? 0 : -1;
    T x = invGeneral(b, a);
    return x == -1 ? -1 : ((1 - (LL)b * x) / a + b) % b;
}

template<class T> struct modular {
    T val;
    explicit operator T() const { return val; }
    modular() { val = 0; }
    modular(const LL& v) {
        val = (-MOD <= v && v <= MOD) ? v : v % MOD;
        if (val < 0) val += MOD;
    }

    friend ostream& operator<<(ostream& os, const modular& a) { return os << a.val; }
    friend void pr(const modular& a) { pr(a.val); }
    friend void re(modular& a) { LL x; re(x); a = modular(x); }

    friend bool operator==(const modular& a, const modular& b) { return a.val == b.val; }
    friend bool operator!=(const modular& a, const modular& b) { return !(a == b); }
    friend bool operator<(const modular& a, const modular& b) { return a.val < b.val; }

    modular operator-() const { return modular(-val); }
    modular& operator+=(const modular& m) { if ((val += m.val) >= MOD) val -= MOD; return *this; }
    modular& operator-=(const modular& m) { if ((val -= m.val) < 0) val += MOD; return *this; }
    modular& operator*=(const modular& m) { val = (LL)val*m.val%MOD; return *this; }
    friend modular pow(modular a, LL p) {
        modular ans = 1; for (; p; p /= 2, a *= a) if (p & 1) ans *= a;
        return ans;
    }
    friend modular inv(const modular& a) {
        auto i = invGeneral(a.val, MOD); assert(i != -1);
        return i;
    } // equivalent to return exp(b,MOD-2) if MOD is prime
    modular& operator/=(const modular& m) { return (*this) *= inv(m); }

    friend modular operator+(modular a, const modular& b) { return a += b; }
    friend modular operator-(modular a, const modular& b) { return a -= b; }
    friend modular operator*(modular a, const modular& b) { return a *= b; }
    friend modular operator/(modular a, const modular& b) { return a /= b; }
};

using MI = modular<int>;
using PMI = pair<MI, MI>;
using VMI = vector<MI>;
using VPMI = vector<PMI>;


namespace debug {
    template < typename _T > inline void _debug(const char *s, _T x) { cerr << s << " = " << x << "\n"; }
    template < typename _T, typename... args > void _debug(const char *s, _T x, args... a) { while (*s != ',') cerr << *s++; cerr << " = " << x << ','; _debug(s + 1, a...); }

#if 1  && defined(LOCAL)
#define debug(...) _debug(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) 1999
#define cerr if(0) cout
#endif
}
using namespace debug;

template <class T> bool setMax(T& v, T newV) { if (v < newV) { v = newV; return true; } return false; }
template <class T> bool setMin(T& v, T newV) { if (v > newV) { v = newV;    return true; } return false; }
LL sq(LL a) {return a*a;}


const int N = 1e6;
LL dp[2][N];

auto solve()
{

    int n;
    LL m;
    re(n,m);
    setMin(m, (LL)N-1);

    int cur = 0;
    int nex = 1;
    FOR(i,n)
    {
    	swap(cur, nex);
    	LL a;
    	LL maxi = -INF;
    	re(a);

    	if(i == 0)
    	{
    		dp[nex][0] = 0;
    		maxi = 0;
    	}
    	else
    	{
    		dp[nex][0] = -INF;
    	}

    	FOR(i,1,m+1)
    	{
    		LL nowy = dp[cur][i-1] + __builtin_popcount(i) * a;
    		setMax(maxi, nowy);
    		dp[nex][i] = maxi;
    		// debug(i, maxi); 
    	}
    	// debug("end");	
    }

    prln(dp[nex][m]);
}

int main()
{   
    // #ifndef LOCAL
        // f1reopen("input.txt", "r", stdin);
        // freopen("output.txt", "w", stdout);
    // #endif

    BOOST;
    cout << fixed << setprecision(50);
    int t = 1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
    return 0;
}