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

int main()
{
    //cout << __builtin_popcount(4) << endl;
int n;
int pomx;
long long m;
scanf("%d%lld", &n, &m);
int t[n];
long long mx = LLONG_MIN;
for(int i = 0; i < n; ++i){
    scanf("%d", &t[i]);
}
int ile = 0;
for(int i = n-1; i <= m; ++i){
    ile = 0;
    int p = 0;
    for(int j = n-1; j >=0; --j){
          //cout<<t[j]<<" "<<j<<endl;
        pomx =  __builtin_popcount(i-p);
        ile += t[j] * (pomx);

        p++;

    }
  //  cout<<ile<<endl;
    if(mx < ile)
        mx = ile;
}
//cout<<mx<<endl;
printf("%lld", mx);
    return 0;
}