#include <bits/stdc++.h>
using namespace std;

ifstream f("minim2.in");
ofstream g("minim2.out");

int n,x,nr;
bool ap[100001];

double a[100001],s,A,B,record;
int main()
{



    f >> n;

    for(int i=1;i<=n;i++)
    {
      f >> x;
        a[i]=x;
        s+=a[i];
    }
   f >> A >> B >> record;

    if(record>s){
            printf("0");
            return 0;
    }
   // printf("%f %f\n",s,record);
    sort(a+1,a+n+1);



    for(int i=n;i>=1;i--)
    {
        s=s-a[i];
        if(!ap[i])
        {
            ap[i]=1;
            a[i]=a[i]*A;
            s=s+a[i];
        }
        else{
            a[i]=a[i]*B;
            s=s+a[i];
        }
        nr++;
        if(s<record) {
              // printf("da");
               break;
        }

        if(ap[i-1]==0)
        {
            if((a[i-1]-a[i-1]*A)<=(a[i]-a[i]*B))
                i++;

        }
        else
        {
            if((a[i-1]-a[i-1]*B)<=(a[i]-a[i]*B))
                i++;

        }
    }

   // printf("%lf  %lf\n",s,record);

   g << nr;
    return 0;

}