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