#include <stdio.h>
 
int main()
{
int n,m,i,g=0;
float sum=0;
  
scanf("%d%d",&n,&m);
int a[n];
for(i=0;i<n;i++){
	scanf("%d",&a[i]);
	sum+=a[i];
}
 
for(i=0;i<n;i++){
	if((float)a[i]>=sum/4/m){g++;}
	if(g>=m){break;}
}
if(g>=m){printf("Yes\n");}
else{printf("No\n");}
return 0;
}