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

#define PII pair<int, int>
#define VI vector<int>
#define VPII vector<PII>
#define LL long long
#define LD long double
#define f first
#define s second
#define MP make_pair
#define PB push_back
#define endl '\n'
#define ALL(c) (c).begin(), (c).end()
#define SIZ(c) (int)(c).size()
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
#define FOR(i, b, e) for (int i = (b); i <= (int)(e); i++)
#define FORD(i, b, e) for (int i = (b); i >= (int)(e); i--)
#define ll long long
#define st f
#define nd s
#define pb PB
#define eb emplace_back
#define mp make_pair				
#define siz(c) SIZ(c)
const int inf = 1e9 + 7;
const LL INF = 1e18L + 7;
 
#define sim template<class n
sim, class s> ostream & operator << (ostream &p, pair<n, s> x)
{return p << "<" << x.f << ", " << x.s << ">";}
sim> auto operator << (ostream &p, n y) ->
typename enable_if<!is_same<n, string>::value, decltype(y.begin(), p)>::type
{int o = 0; p << "{"; for (auto c : y) {if (o++) p << ", "; p << c;} return p << "}";}
void dor() {cerr << endl;}
sim, class...s> void dor(n p, s...y) {cerr << p << " "; dor(y...);}
sim, class s> void mini(n &p, s y) {if (p > y) p = y;}
sim, class s> void maxi(n &p, s y) {if (p < y) p = y;}

#ifdef DEB
#define debug(...) dor(__FUNCTION__, ":", __LINE__, ": ", __VA_ARGS__)
#else
#define debug(...)
#endif

#define I(x) #x " = ", (x), " "
#define A(a, i) #a "[" #i " = ", i, "] = ", a[i], " "

#ifndef LOCAL
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;

template <typename T>
using ordered_set =
	tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#else
#include</Users/dawid/algo/mac/ordered_set>
#endif

#define int ll
const int N = 207;

int n, m;

int a[N];
int pref[N];

int dp[67][2][N][N];

int seg(int l, int r)
{
	return pref[r] - pref[l-1];
}

int32_t main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(NULL);

	cin >> n >> m;

	for(int i = 1; i <= n; ++i)
	{
		cin >> a[i];
		pref[i] = a[i] + pref[i-1];
	}

	for(int l = 1; l <= n; ++l)
	{
		for(int r = l; r <= n; ++r)
		{
			if(l==r)
				dp[0][0][l][r] = dp[0][1][l][r] = 0;
			else
				dp[0][0][l][r] = dp[0][1][l][r] = -2*INF;
		}
	}

	for(int b = 0; b < 60; ++b)
	{
		for(int moge = 0; moge < 2; ++moge)
		{
			for(int l = 1; l <= n; ++l)
			{	
				for(int r = l; r <= n; ++r)
				{
					if(moge)
					{
						dp[b+1][moge][l][r] = max(0ll, seg(l, r)) + dp[b][moge][l][r];

						for(int k = l; k < r; ++k)
						{
							maxi(dp[b+1][moge][l][r], dp[b][moge][l][k] + dp[b][moge][k+1][r] + seg(k+1, r)); 
						}
					}
					else
					{
						if(m&(1ll<<b))
						{
							dp[b+1][moge][l][r] = max(dp[b][1][l][r], dp[b][0][l][r] + seg(l, r));

							for(int k = l; k < r; ++k)
							{
								maxi(dp[b+1][moge][l][r], dp[b][1][l][k] + dp[b][0][k+1][r] + seg(k+1, r));
							}
						}
						else
						{
							dp[b+1][moge][l][r] = dp[b][moge][l][r];
						}
					}
				}
			}
		}
	}

	cout << dp[60][0][1][n] << endl;
}