#include <stdio.h>

void chmin(long long* a, long long b)
{
	if (*a > b) *a = b;
}

int main()
{
	int i, N, M, A[200001];
	scanf("%d %d", &N, &M);
	for (i = 1; i <= N; i++) scanf("%d", &(A[i]));
	
	long long sum = 0, ans = A[1];
	for (i = 1; i <= N; i++) {
		sum += A[i];
		chmin(&ans, sum / i / M);
	}
	printf("%lld\n", ans);
	fflush(stdout);
	return 0;
}