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

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n,k,bottlesamount=1,result=2019,bottle;
    cin >> n >> k;
    for(int i=0;i<n;i++){
        for(int j=0;j<bottlesamount;j++){
            cin >> bottle;
            if(bottle<result && (j+1)*(i-j+1)<=k)result=bottle;
        }
        bottlesamount++;
    }
    cout << result << endl;
}