//          B

#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long
#define ld double
#define llu long long unsigned

int main()
{
    fast;
    int t;
//    cout<<fixed<<setprecision(10)<<acos(-1)<<endl;
    cin>>t;
    int count = 0;
    while( t-- )
    {
        ld m , d;
        cin>>m>>d;
        ld v = m / d;
        ld radius = v / (4.0/3.0 * acos(-1));
        radius = pow( radius , 1.0/3.0 );
        cout<<"Case "<<++count<<": "<<fixed<<setprecision(4)<<4.0*acos(-1)*pow( radius , 2 )<<endl;
    }
    return 0;
}

                            //          C

#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long
#define ld double
#define llu long long unsigned

int main()
{
    fast;
    int t;
    cin>>t;
    int count = 0;
    while( t-- )
    {
        ld r;
        cin>>r;
        ld radius1 = sqrt(r*r + r*r)/2;
//        cout<<radius1<<endl;
        ld radius2 = sqrt(radius1*radius1 + radius1*radius1)/2;
//        cout<<radius2<<endl;
        ld overall = acos(-1) * pow( radius2 , 2 ) * 0.5;
        ld quarter1 = acos(-1) * pow( radius1 , 2 ) / 4;
        ld extras = quarter1 - radius1 * radius1 * 0.5;
        cout<<"Case "<<++count<<": ";
        cout<<fixed<<setprecision(4)<<overall-extras<<endl;
    }
    return 0;
}