#include<stdio.h>
int main(){
  int N,M,A[100],i,j,k,goukei=0,counter=0;
  float a;
  scanf("%d %d",&N,&M);
  for(i=0;i<N;i++){
    scanf("%d",&A[i]);
    goukei+=A[i];
  }
 

  a=goukei/(4.0*M);
 
  

  for(i=0;i<N;i++){
    if(a<=A[i]){
      counter++;
    }
  }

  if(counter>=M){
    printf("Yes\n");
  }
  else{
    printf("No\n");
  }
  return 0;
}
    