#include <stdio.h>

int main(){
  int N,i;
  double M,sum=0,count=0;
  double a[N];
  scanf("%d %lf",&N,&M);
  for(i=0;i<N;i++){
    scanf("%lf",&a[i]);
    sum+=a[i];
  }
  
  for(i=0;i<N;i++){
    if((a[i]/sum)>=(1/(4*M))){
      count++;
    }
  }
  if(count>=M){
    printf("Yes\n");
  }else{
    printf("No\n");
  }
}

  
