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#include <iostream>
//#include <fstream>

using namespace std;

int main() {

    ios_base::sync_with_stdio(0);
    cin.tie(0);

//    std::ifstream in("0.in");
//    std::streambuf *cinbuf = std::cin.rdbuf(); //save old buf
//    std::cin.rdbuf(in.rdbuf()); //redirect std::cin to in.txt!

//    while (std::cin.peek() != std::char_traits<char>::eof()) {

    int n, k;
    cin >> n;
    cin >> k;

    int lowest = 2019;
    int next = 0;
    int removeCount = 0;

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < i + 1; j++) {
            cin >> next;
            removeCount = (j + 1) * (i - j + 1);
            if (removeCount <= k && next < lowest) {
                lowest = next;
            }
        }
    }

    std::cout << lowest << std::endl;
//    }
    return 0;
}