#include<stdio.h>
int main(void){
  int  count,i,n,m,a[110],all=0;
  scanf("%d %d",&n,&m);
  for(i=0;i<n;i++){ scanf("%d",&a[i]);  all=all+a[i];  }
  i=0;
  count=n;
  for(i=0;i<n;i++){ if(a[i]<all/(4*m)){count--;} }
  puts(count>=m?"Yes":"No");
  return 0; 
}
