#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#include<string.h>
#define MAX 100
#define MAXI 1000
#define MIN 1
#define MID
int main(void){
  int M,N,a[MAX],count=0,sum=0;
  scanf("%d",&N);
  scanf("%d",&M);
  for(int i=0;i<N;i++){
   scanf("%d",&a[i]);
   sum=sum+a[i];
   }
  for(int i=0;i<N;i++){
   if(a[i]*(4*M)>=sum)count++;
   }
  if(count>=M)printf("Yes");
   else printf("No");
   exit(0);
   }