#include<bits/stdc++.h>

using namespace std;

int t1,t2,s1,s2,w;

int get(int b)

{

    int s=(s2-s1)*(t2-t1)*;

    int d=s2-s1;

    int y=s2-b;

    if(y<=t1)   return ;

    if(y<=t1+d) return (y-t1)*(y-t1);

    if(y<=t2)   return d*(y-t1+y-t1-d);

    if(y<=t2+d) return s-(t2+d-y)*(t2+d-y);

    return s;

}

int main()

{

    int T; scanf("%d",&T);

    for(int i=;i<=T;i++)

    {

        scanf("%d %d %d %d %d",&t1,&t2,&s1,&s2,&w);

        if(t2-t1<s2-s1) { swap(t1,s1); swap(t2,s2); }

        int area=get(-w);

        int   num=get(w);

        area-=num;

        int s=(s2-s1)*(t2-t1)*;

        printf("Case #%d: %.8f\n",i,area*1.0/s);

    }

}