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#include <iostream>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    int n, k;
    cin >> n >> k;
    int max = 2020;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= i; j++) {
            int a;
            cin >> a;
            if (a < max && ((i - j) + 1) * (j + 1) <= k) {
                max = a;
            }
        }
    }
    cout << max;
    return 0;
}