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#include <iostream>

using namespace std;

int n, k, a, mini = 3000;

int main()
{
    ios_base::sync_with_stdio(0);

    cin >> n >> k;
    for (int i = 1;i <= n;i++)
    {
        for (int j = 1;j <= i;j++)
        {
            cin >> a;

            if(j*(i-j+1)<=k)
                {
                if (mini > a) mini = a;
                }
            else if(j!=1)
            {
                j=i-j+2;
            }
            else
            {
                cout<<mini;
                return 0;
            }
        }
    }
    cout << mini;

    return 0;
}