using System;
                    
public class Program
{
    public static void Main()
    {
        var a = 1;
        var b = 20;
        ref int x = ref (a > 5) ? ref a : ref b;
        
        Print();
        x = 15;
        Print();
        
        void Print() { Console.WriteLine($"a = {a}; b = {b}"); }
    }
}