#include<stdio.h>
#include<stdlib.h>
#define eps 0.0000001
long n;
float d[1005];
long p;
int main()
{
freopen("minim2.in","r",stdin);
freopen("minim2.out","w",stdout);
int i,j;
float a,b,r,s;
scanf("%d",&n);
for(i=1;i<=n;i++)
 scanf("%f",&d[i]);
scanf("%f%f%f",&a,&b,&r);
j=0;
if(a<b)
 for(i=1;i<=n;i++)
  if(d[i]*a>r)
   {
   d[i]=d[i]*a;
   j++;
   break;
   }
for(i=1;i<=n;i++)
 while(r-(d[i]/b)<eps)
  {
  d[i]=d[i]*b;
  j++;
  }
printf("%d",j);
return 0;
}