#include<stdio.h>
 
int main(){
  int n,m,i;
  int sum=0;
  int count=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(a[i]*4*m>= sum)
      count++;
  }
  
  if(count>=m)
    printf("Yes\n");
  else
    printf("No\n");
  
  return 0;
}