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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 vintage, bottles_to_remove;
    int oldest_possible = 2019;

    for (int i = 0; i < n; i++) {
        for (int j = 0; j <= i; j++) {
            cin >> vintage;
            bottles_to_remove = (j + 1) * (i - j + 1);
            if (bottles_to_remove <= k && vintage < oldest_possible) {
                oldest_possible = vintage;
            }
        }
    }

    cout << oldest_possible << "\n";

    return 0;
}