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#include <cstdio>

int main(int argc, char* argv[])
{
	int n, k;
	scanf("%d %d", &n, &k);
	int curr;
	int ans = 0x7FFF7FFF;
	for(int i=0; i<n; i++) {
		for(int j=0; j<=i; j++) {
			scanf("%d", &curr);
			if(curr < ans && (i-j+1)*(j+1)<=k)
				ans = curr;
		}
	}
	printf("%d\n", ans);
	return 0;
}