using System;
using System.Linq;

public class Test
{
    public static int TrueCount(params bool[] booleans)
    {
        return booleans.Count(b => b);
    }

    public static void Main()
    {
        bool bool1 = true;
        bool bool2 = false;
        bool bool3 = true;
        bool onlyOneTrue = TrueCount(bool1,bool2,bool3)==1;
        Console.WriteLine("Only one true? " + onlyOneTrue);
    }
}