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#include<bits/stdc++.h>
using namespace std;

int n,k,x,nax = 3000;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> k;

    for(int w = 1 ; w <= n ; w++){
        for(int p = 1 ; p <= w ; p++){
            cin >> x;
           // cout << w << " " << p << " " << p*(w-p+1) <<"\n";
            if(p*(w-p+1) <= k) nax = min(x,nax);
        }
    }
    cout << nax;
}
/*
5 7
1999
2019 2010
850 1500 1600
900 900 710 900
1000 800 600 800 1000
*/