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#include <iostream>

using namespace std;

int main()
{
	int min = 3200;
	int n, k;
	
	cin >> n >> k;

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

		if (a < min && (i - j + 1) * j <= k)
			{
				min = a;
			}
		}

	}

	cout << min;
}