#include <stdio.h>

int main()
{
	int N, i, count = 0;
	int  vote = 0, M;
	int A[100];

	scanf("%d %d", &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;
}
