#include<stdio.h>

int main(void)
{
   int n,m,a[100],x,i,b,c;
   double y;
   b=0; c=0;
   scanf("%d%d",&n,&m);
   x=4*m;
   for(i=0; i<n; i++){
      scanf("%d",&a[i]);
      b+=a[i];
   }
   y=(double)b/(double)x;
   for(i=0; i<n; i++){
      if(a[i]>=y)
        c=c+1;
   }

   if(c>=m)
      printf("Yes\n");
   else
      printf("No\n");
   return 0;
}
