//Test7.cs
using System;
class Test7 {

  static int f (int x) { int y; if (x > 0) y = g (x - 1); else y = 
x; return y; }

  static int g (int x) { int y; if (x > 0) y = f (x - 2); else y = 
x; return y; }  

  public static void Main()
  {
      Console.WriteLine(f(10));
      Console.WriteLine(g(10));
  }

}