#include<stdio.h>

int main(void){

  int n,m,sum=0,i,count=0;
  int a[1000];
  scanf("%d %d",&n,&m);

  for(i=0;i<n;i++){
    scanf("%d",&a[i]);
    sum+=a[i];
  }

  for(i=0;i<n;i++){
    if(a[i]>=sum/(4*m))count++;
    }

  if(m<=count)printf("Yes");
  else printf("No");


  return 0;
}