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#include <iostream>

using namespace std;

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

    int n, k;
    int res = 2020;
    int bottle_year, need_to_take;

    cin >> n >> k;

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

            if (j == 1 || j == i) {
                need_to_take = i;
            } else {
                need_to_take = (i - j + 1) * j;
            }

            if (need_to_take <= k && bottle_year < res) {
                res = bottle_year;
            }
        }
    }

    cout << res << endl;

    return 0;
}