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#include<bits/stdc++.h>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(0);
    int n,q;
    int mini = 10000;
    cin >> n >> q;
    int val = 0;
    for(int k=1;k<=n;k++)
    {
        for(int i=1;i<=k;i++)
        {
            cin >> val;
            if(i*(k-i+1) <=q )
                mini = min(val,mini);
           //cout << i << " " << k << " " << i*(k-i+1) <<endl;
        }
    }
    cout << mini<<endl;
}