#include<stdio.h>

int main(void)
{
   int n, m, a[100], i, x=0, s=0;

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

   for(i=0;i<n-1;i++)
      if((4*m)*a[i]>=s) x++;

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