#include <stdio.h>
 
int main(){
  int n, m;
  scanf("%d %d", &n, &m);
  int a[n], sum=0;
  for(int i=0; i<n; i++){
    scanf("%d", &a[i]);
    sum+=a[i];
  }
  double t=(double) sum/(4*m);
  int count=0;
  for(int i=0; i<n; i++)
  if((double) a[i]>=t)count++;
  if(count>=m)printf("Yes\n");
  else printf("No\n");
}