#include <stdio.h>
int main(){
  int N,M,i,sum,count;
  int A[100];
  sum=0;
  count=0;
  scanf("%d %d",&N,&M);
  for(i=0;i<N;i++){
    scanf("%d",&A[i]);
    sum=sum+A[i];
  }
  for(i=0;i<N;i++){
    if(A[i]>=sum/(4*M)) count++;
  }
  if(count>=M) printf("Yes");
  else printf("No");
  return 0;
}