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#include <iostream>

const int maxn = 2001;
int num_bottles[maxn][maxn];
int bottle_age[maxn][maxn];

int main() {
    int n, k;
    int min_age = 100000;
    std::cin >> n >> k;
    for (int i = 0 ; i < n ; i++) {
        for (int j = 0 ; j <= i ; j++) {
            int age;
            std::cin >> age;
            if ((i - j + 1) * (j + 1) < k && min_age > age) {
                min_age = age;
            }
        }
    }
    std::cout << min_age;
    return 0;
}