#include<stdio.h>

int main(){
  int n,m,i;
  scanf("%d %d",&n,&m);
  int a[1001],all=0,count=0;
  for(i=0;i<n;i++){
    scanf("%d",&a[i]);
    all=all+a[i];
  }
  for(i=0;i<n;i++){
    if(a[i]*4*m>=all){
      count++;
    }
  }
  if(count>=m)
    printf("Yes");
  else
    printf("No");  
}
