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#include <iostream>
#include <algorithm>
#include <cstdint>

using namespace std;

const int infA = 2020;

int main(int argc, const char* argv[])
{
    int k,n;
    int mina = infA;

    std::ios::sync_with_stdio(false);

    cin >> n >> k;

    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= i; ++j) {
            int a;
            cin >> a;

            int mink = j*(i-j+1);
            if (mink <= k) {
                mina = min(a, mina);
            }
        }
    }
    cout << mina<< endl;
}