1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
/*
PA 2019
[B] Wina (WIN)
Bartosz Pieszko
*/
#include <bits/stdc++.h>

int main() {
  int n, k; std::cin >> n >> k;
	int x, res = 1 << 30;
	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= i; ++j) {
			std::cin >> x;
			if ((i - j + 1) * j <= k)
				res = std::min(res, x);
		}
	}
	std::cout << res << std::endl;
  return 0;
}