#include<stdio.h>
int main(){

	int n,m,a[100],i,count=0,sum=0;

	scanf("%d%d",&n,&m);

	for(i=0;i<n;i++){
		scanf("%d",&a[i]);
		sum+=a[i];
	}

	for(i=0;i<n;i++){
		if((float)a[i]/(float)sum>=1.0/(4.0*(float)m))
			count++;
	}

	if(count>=m)
		printf("Yes");

	else
		printf("No");	

	return 0;
}