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#include <bits/stdc++.h>

using namespace std;

int n, k, best = 2020, incomer;

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

    cin >> n >> k;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 0; j < i; j++)
        {
            cin >> incomer;
            best = (j + 1) * (i - j) <= k && incomer < best ? incomer : best;
        }
    }
    cout << best << '\n';
}