#include<stdio.h>
#include<string.h>
#include <iostream>
using namespace std;
const int N = 10005;
double a[N],temp[N];
int main()
{
    int tcase;
    scanf("%d",&tcase);
    int t = 1;
    while(tcase--){
        int n;
        double k1,k2,k,sum=0;
        scanf("%d%lf%lf%lf",&n,&k1,&k2,&k);
        for(int i=1;i<=n;i++){
            scanf("%lf",&a[i]);
            sum += a[i];
        }
        if(sum>k){
            printf("Case #%d: 0\n",t++);
            continue;
        }
        if(k1+k2<=1&&k1+k2>=-1) {
            printf("Case #%d: inf\n",t++);
            continue;
        }
        int cnt=0;
        while(sum<=k){
            double pre = sum;
            sum = sum*(k1+k2);
            cnt++;
        }
        printf("Case #%d: ",t++);
        printf("%d\n",cnt);
    }

    return 0;
}