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#include <iostream>
#include <algorithm>

using namespace std;
int n, k, rzad, rok, minrok = 2069, x;

int main()
{
        ios_base::sync_with_stdio(0);
        cin>>n>>k;
        for ( int i = 1; i <= n; i++){
            for ( int j = 1; j <= i; j++){
                    x = j * (i - j + 1);
                    cin>>rok;
                    if(x <= k) minrok = min(minrok,rok);
            }
        }
        cout<<minrok;
    return 0;
}