#include <stdio.h>

int main()
{
	int i, N, M, A[101], sum = 0, count = 0;
	scanf("%d %d", &N, &M);
	for (i = 1; i <= N; i++) scanf("%d", &(A[i]));
	for (i = 1; i <= N; i++) sum += A[i];
	for (i = 1; i <= N; i++) if (A[i] * M * 4 >= sum) count++;
	if (count >= M) printf("Yes\n");
	else printf("No\n");
	fflush(stdout);
	return 0;
}