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#include <iostream>

using namespace std;

int main()
{
    int n, k;
    cin >> n >> k;
    int min_year = 2019;

    for (int row = 1; row <= n; ++row)
    {
        for (int col = 1; col <= row; ++col)
        {
            int year;
            cin >> year;
            int min_out = col * (row - col + 1);
            if (min_out <= k && year < min_year)
            {
                min_year = year;
            }
        }
    }

    cout << min_year << endl;
    return 0;
}