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#include <bits/stdc++.h>
using namespace std;

int minimum= INT_MAX;
int n, m,liczba;
int trudnosc;
vector <int> V [ 2123 ];
int main()
{
	ios_base::sync_with_stdio(0);
	cin >> n >> m;
	for ( int i = 1; i <= n; i++ )
	{
		for ( int j = 1; j <= i; j++ )
		{
			cin >> liczba;
			V [ i ].push_back(liczba);
		}
	}
	for ( int i = 1; i <= n; i++ )
	{
		for ( int j = i; j <= n; j++ )
		{
			trudnosc = i * (j - i + 1);
			if ( trudnosc <= m )
			{
				minimum = min ( minimum, V [ j ].back()); 
			}
			V [ j ].pop_back();
		}
	}
	cout << minimum << '\n';
	return 0;
}