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#include <iostream>
using namespace std;

int n, k, a, cost, result = 2020;

int main()
{
    cin >> n >> k;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j <= i; j++)
        {
            cin >> a;
            cost = (j + 1) * (i - j + 1);
            if (cost <= k) result = min (a, result);
        }
    }
    cout << result;
}