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#include <iostream>

using namespace std;

int main()
{
	int n, k;
	cin >> n >> k;
	int result = 2020;
	for (int i = 1; i <= n; ++i)
		for (int j = 1; j <= i; ++j)
		{
			int a;
			cin >> a;
			if ((i - j + 1) * j <= k)
				if (a < result)
					result = a;
		}
	cout << result << endl;
	return 0;
}