#include<stdio.h>
int main()
{
	int n,m,a[100],i,x=0,c=0;
	double y=0;
	scanf("%d %d",&n,&m);
	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
		y+=a[i];
	}
	y=y/(4*m);
	for(i=0;i<n;i++){
		if(y<=a[i]) c++;
	}
	if(c>=m) printf("Yes\n");
	else printf("No\n");
	return 0;
}
