#include <stdio.h>

int main(void)
{
	int N, i, count = 0;
	float vote = 0, M;
	int A[100];
	
	scanf("%d %f", &N, &M);
	
	for(i = 0; i < N; i++){
	
		scanf("%d", &A[i]);
		vote = vote + A[i];
	}
	
	for(i = 0; i < N; i++){
	
		if(A[i] >= vote/((4*M))) count++;
	
	}
	
	if(count >= M) printf("\nYes");
	else printf("\nNo");
	
	return 0;
}