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#include <bits/stdc++.h>
using namespace std;
int n, m;
int f[110][110];
int a[100 + 10][110];
int main() {
    cin >> n>>m;
 
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            cin>>a[i][j];
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
          for (int k = 0; k <= j; k++)
    f[i][j]=max(f[i][j],f[i-1][j-k]+a[i][k]);
    cout<<f[n][m];
    return 0;
}