#include <stdio.h>

int main(){
  int N,M,A[100],all=0;
  scanf("%d%d",&N,&M);
  for(int i=0;i<N;i++){
    scanf("%d",&A[i]);
    all+=A[i];
  }
  int num=0;
  //printf("%d",all/(4*M));
  for(int i=0;i<N;i++)if(A[i]>=all/(4*M))num++;
  if(num>=M)printf("Yes");
  else printf("No");
}