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#include <iostream>

using namespace std;

int main(){
    int n, k;
    cin >> n >> k;

    int w = 3000;

    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= i; j++){
            int wiek;
            cin >> wiek;

            int l = (i-(j-1))*j;
            if(wiek < w && l <= k){
                w = wiek;
            }
        }
    }

    cout << w << endl;

    return 0;
}