#include <iostream>
using namespace std;
int main()
{
    int T,n;
    double k1,k2,k,x,sum;
    cin>>T;
    for(int cas=1;cas<=T;cas++)
    {
        sum=0;
       cin>>n>>k1>>k2>>k;
       double h=k1+k2;
       while(n--)
       {
           cin>>x;
           sum=sum+x;
       }
       int t=0;
       if(sum>k)
       {
           cout<<"Case #"<<cas<<": "<<"0"<<endl;
           continue;
       }
       if(h<1&&h>-1)
       {
           cout<<"Case #"<<cas<<": "<<"inf"<<endl;
           continue;
       }
       while(sum<=k)
       {
           t++;
           sum=sum*h;
       }
       cout<<"Case #"<<cas<<": "<<t<<endl;
    }
    return 0;
}