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

int main(){
	
	int n, k, baryla, ans = 2019;
	cin >> n >> k;
	for (int i = 1; i <= n; i ++)
		for (int j = 1; j <= i; j ++){
			cin >> baryla;
			int x = i - j + 1;
			if (j * (i - j + 1) <= k)
				ans = min(ans, baryla);
		}
	cout << ans << "\n";
	
	return 0;
}