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

typedef long long int LL;
typedef unsigned long long int uLL;
typedef unsigned int uint;
typedef long double ld;



int main(){
    cin.tie(NULL);
    ios_base::sync_with_stdio(0);
    int n, k;
    cin >> n >> k;
    int ans = 1000000;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= i; j++){
            int a;
            cin >> a;
            int s = (i-j+1)*j;
            if(s <= k){
                ans = min(a, ans);
            }
        }
    }
    cout << ans << '\n';
    return 0;
}