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#include <bits/stdc++.h>

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

    int n, k, m = 2020, i, j, y;
    std::cin >> n >> k;

    for (i = 1; i <= n; ++i) {
        for (j = 1; j <= i; ++j) {
            std::cin >> y;
            if ((y < m) && ((i - j + 1) * j <= k))
                m = y;
        }
    }

    std::cout << m << "\n";
    return 0;
}