#include <stdio.h>
int main(void){
  int i, n, m, a[100], sum, counter;
  
  if( scanf("%d %d",&n ,&m)==1 );
  for(i=0;i<n;i++) if( scanf("%d",&a[i])==1 );
  
  sum = 0;
  for(i=0;i<n;i++) sum += a[i];
  
  counter = 0;
  for(i=0;i<n;i++)
    if(a[i] * 4 * m  >= n)
      counter++;
  
  if(counter >= m)
    printf("Yes");
  else
    printf("No");
  
  return 0;
}