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#include <iostream>

using namespace std;
int main()
{
    int n, k;
    cin >> n >> k;
    int m = 2019; //przechowujemy minimalna
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= i; j++)
        {
            int in;
            cin >> in;
            if(in <= m && j*(i-j+1) <= k)
                m = in;
        }
    cout << m << endl;
    return 0;
}