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#include <cstdio>

int main() {
	int n, k;
	scanf("%d%d", &n, &k);
	int m = 1, i = 1;
	int ans = 2019;
	while (m <= n) {
		int a;
		scanf("%d", &a);
		if (ans > a && i * (m - i + 1) <= k)
			ans = a;
		i++;
		if (i > m) {
			i = 1;
			m++;
		}
	}
	printf("%d\n", ans);
}