#include <stdio.h>
int main(void){
	int i,n,m,a[10000],so=0,ans=0;
	double q;
	scanf("%d %d",&n,&m);
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
		so+=a[i];
	}
	q=(double)so/(4*m);
	
	
	for(i=0;i<n;i++){
		if(a[i]>=q){
			ans++;
		}
	}
	if(ans>=m){
		printf("Yes\n");
	}else{
		printf("No\n");
	}
	
	return 0;
}