#include <stdio.h>

int main(){
	int N,M,A[100],all=0;
    scanf("%d%d",&N,&M);
    for(int i=0;i<N;i++){
    	scanf("%d",&A[i]);
    	all+=A[i];
    }
    int num=N;
    for(int i=0;i<N;i++){
    	if(A[i]<all/(M*4))num--;
    }
    if(num>=M)printf("Yes");
    else printf("No");
}