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#include <iostream>
using namespace std;

int n, k, a, mini = 2020;

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);

	cin >> n >> k;

	for (int i = 1; i <= n; i++)
	{
		for (int j = 1; j <= i; j++)
		{
			//cout << (i - j + 1) * j << " ";
			cin >> a;
			if ((i - j + 1)*j <= k)
			{
				if (a < mini)
					mini = a;
			}
		}
		//cout << endl;
	}

	cout << mini;

	return 0;
}

/*
5 7
1999
2019 2010
850 1500 1600
900 900 710 900
1000 800 600 800 1000
*/