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