#include <stdio.h>

int main(void)
{
 int N,M,A[1000];
 int    i,s,count;

  scanf("%d%d",&N,&M);

  for(i=1;i<=N;i++){
   scanf("%d",&A[i]);
 }
   s=0;
  for(i=1;i<=N;i++){
    s=s+A[i];
  }

   count=0;
  for(i=1;i<=N;i++){
   if(A[i]>=s/(4*M))
      count++;
  }
   if(count>=M)     
     printf("Yes");
   else
     printf("No");

   return 0;
 }

     
