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#include <iostream>
using namespace std;

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

    int n, k;
    cin >> n >> k;
    int min = 1000000;

    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= i; j++){
            int year;
            cin >> year;
            int steps = j * (i - j + 1);
            if(steps <= k && year < min)
                min = year;
        }
    }
    cout << min << "\n";

    return 0;
}