#include<stdio.h>

int main(){
   int N,M;
   int A[1000];
   int total,count = 0;
   scanf("%d %d",&N,&M);

   for(int i = 0;i<N;i++){
      scanf("%d",&A[i]);
      total = total+A[i];
   }
   for(int i = 0;i<N;i++){
      if(A[i]*4*M>=total){
         count++;
      }
   }
   if(count>=M){
      printf("Yes");
   }else{
      printf("No");
   }
   return 0;
}
 