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#include <bits/stdc++.h>

using namespace std;

int main(){
    int n, m, k, wyn, war = 2022;
    cin >> n >> m;

    for(int i=1; i<=n; i++){
        for(int j=1; j<=i; j++){
            cin >> k;
            if(i <= m){
                wyn = j * (i-j +1);
                if(wyn <= m){
                    war = min(war,k);
                }
            }
        }
    }
    cout << war;
    return 0;

}