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

int n, k;
int res = 2019;

int main() {
	scanf("%d %d", &n, &k);
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= i; j++) {
			int val;
			scanf("%d", &val);
			if (val < res && (i-j+1)*j <= k)
				res = val;
		}
	}
	printf("%d\n", res);
}