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//Filip Wilkowsi XIII LO w Szczecinie

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

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

	int n, k;
	cin >> n >> k;
	int ans = INT_MAX;
	for(int i = 1; i <= n; ++i)
		for(int j = 1; j <= i; ++j){
			int a;
			cin >> a;
			if((i-j+1)*j  <= k)
				ans = min(ans, a);
		}

	cout << ans;
}