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

int n, k;
const int oo = 2137;
int res = oo;


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

    cin >> n >> k;
    int wart = 1;
    for(int i = 0; i < n; i++){
        int l = 1;
        int p = i + 1;
        for(int j = 0; j < wart; j++){
            int local;
            cin >> local;
            if(l * p <= k){
                res = min(res, local);
            }
            l++;
            p--;
        }
        wart++;
    }
    cout << res;



    return 0;
}