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#include <iostream>

int main() {
    int n, k, year, oldest = 2020;
    std::cin >> n >> k;
    for (int i = 1; i <= n; ++i) {
        for (int j = 1; j <= i; ++j) {
            std::cin >> year;
            if ((i - j + 1) * j <= k) {
                oldest = std::min(oldest, year);
            }
        }
    }
    std::cout << oldest;
    return 0;
}