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#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    int N, K;
    cin >> N >> K;
    int T=2019+1;
    for (int n=0; n<N; n++) {
        for (int k=0; k<=n; k++) {
            int t;
            cin >> t;
            if ((k+1)*(n-k+1)<=K && t<T) T=t;
        }
    }
    cout << T << endl;
    return 0;
}