Infinity Area

#include <bits/stdc++.h>

#pragma optimization_level 3
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("Ofast")//Comment optimisations for interactive problems (use endl)
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")

#define MAX_N 2020
#define ll long long
#define pll pair<ll, ll>
#define vpll vector<pll>
#define vll vector<ll>
#define vvll vector<vll>
#define all(a) begin(a), end(a)
using namespace std;



double solve(ll& r, ll& a, ll& b) {
    double res = M_PI * r * r;
    bool A = true;
    while(r) {
        if(A) r *= a;
        else r /= b;
        A = !A;
        res += M_PI * r * r;
    }

    return res;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.setf(ios::fixed);
    cout.precision(6);
    ll tc, r, a, b;
    cin>>tc;
    for(ll i = 1; i <= tc; i++) {
        cin>>r>>a>>b;
        cout<<"Case #"<<i<<": "<<solve(r,a,b)<<'\n';
    }

    return 0;
}