1 class Program{ 2  3       static void Main(string[] args){ 4  5                 Console.WriteLine(Change(8)); 6           7 } 8  9      private static int Change(int age){10 11          12    if(age==1){13 14             return 10;15 16 17 }else{18 19       return Change(age-1)+2;20 21 22 23 }24 25 26 }27 28 29 }