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#include <iostream>

using namespace std;
int wino, minimum=3000, n;
long long liczbaWin, a, b, iloczyn;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> liczbaWin;
    for (int i=1; i<=n; i++){
        for (int j=1; j<=i; j++){
            cin >> wino;
            if (wino < minimum){
                a = j;
                b = i-j+1;
                iloczyn = a*b;
                if (iloczyn <= liczbaWin)
                    minimum = wino;
            }
        }
    }
     cout << minimum;

    return 0;
}