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#include <iostream>

using namespace std;

int main() {

    int height, bottlesToTake;
    cin >> height >> bottlesToTake;

    int min = 100000;

    for (int i = 1; i < height + 1; i++) {
        for (int j = 1; j <= i; j++) {
            int number;
            cin >> number;

            int bottlesAbove = j * (i - j + 1);

            if (number < min and bottlesAbove <= bottlesToTake){
                min = number;
            }
        }
    }

    cout << min;


    return 0;
}