C++ :

#include<iostream>
#include<algorithm>
#include<iomanip>
using namespace std;
int main()
{
	int T,j=1;
	cin >> T;
	while (T--)
	{
		double p, p1, p2, p3;
		cin >> p >> p1 >> p2 >> p3;
		double a[3];
		a[0] = p1 + p2;
		a[1] = p1 + p3;
		a[2] = p2 + p3;
		a[0] = (1 - a[0]) + p1*(1 - p) + p2*(1 - p);
		a[1] = (1 - a[1]) + p1*(1 - p) + p3*(1 - p);
		a[2] = (1 - a[2]) + p2*(1 - p) + p3*(1 - p);
		sort(a, a + 3);
		cout << std::setiosflags(std::ios::fixed);
		cout <<"Case "<<j++<<": "<<std::setprecision(4)<<a[2] + a[1]<<endl;
	}
	return 0;
}