#include <stdio.h>
#include <math.h>
using namespace std;

#define DIF 0.000001

int abs (int x)
{
    if (x < 0)
        return x * -1;
    return x;
}

float v[1001];
int uz[1001];
float record, A, B, suma;
int n, i, j, k;
int actionari;
float Min, min1;
int Max;
float nr1, nr2, val;

int main ()
{
    FILE *f = fopen ("minim2.in","r");
    FILE *g = fopen ("minim2.out","w");
    fscanf (f,"%d", &n);
    for (i=1; i<=n; ++i)
    {
        fscanf (f,"%f", &v[i]);
        if (v[Max] < v[i])
            Max = i;
        suma += v[i];
        uz[i] = 0;
    }
    fscanf (f,"%f %f %f", &A, &B, &record);
    if (suma < record || abs(suma-record <= DIF))
    {
        fprintf (g,"0");
        return 0;
    }

    while (suma > record || abs (suma-record) > DIF)
    {
        if (suma < record || abs(suma-record <= DIF))
            break;
        actionari ++;
        if (!uz[Max])
        {
            suma -= (v[Max] - v[Max] * A);
            v[Max] *= A;
            uz[Max] = 1;
        }
        else
        {
            suma -= (v[Max] - v[Max] * B);
            v[Max] *= B;
        }
        //printf ("v = %f suma = %f\n", v[Max], suma);
        if (!uz[1])
            nr1 = v[1] * A;
        else
            nr1 = v[1] * B;
        if (!uz[2])
            nr2 = v[2] * A;
        else
            nr2 = v[2] * B;
        if (nr1 > nr2)
        {
            Max = 1;
            val = nr1;
        }
        else
        {
            Max = 2;
            val = nr2;
        }

        for (i=3; i<=n; ++i)
        {
            if (!uz[i])
                nr1 = v[i] * A;
            else
                nr1 = v[i] * B;
            if (nr1 > val)
            {
                Max = i;
                val = nr1;
            }

        }
        if (suma < record || abs(suma-record <= DIF))
            break;
    }
    /*for (i=1; i<=n; ++i)
        printf ("%f ", v[i]);
    printf ("\n\nactionari = %f", suma);*/

    fprintf (g,"%d", actionari - 1);

    fclose(g);
    fclose(f);
    return 0;
}