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Program 1
using System;

public class OperatorsOrNot {

 public static int With (int a, int b, int c, int m){
   return (a % m + b % m + c % m) / 3;
 }

 public static int Without (int a, int b, int c, int m){
   return 
     MyInt.Quotient(
       MyInt.Plus(
         MyInt.Plus(
           MyInt.Remainder(a,m), 
           MyInt.Remainder(b,m)),
         MyInt.Remainder(c,m)),
       3);
 }

// In some languages, such as Lisp,
// with more liberal identifiers rules:
//   (/ (+ (% a m) (% b m) (% c m)) 3) 


 public static void Main(){

   Console.WriteLine(With(18,19,25, 7));     // 4
   Console.WriteLine(Without(18,19,25, 7));  // 4
  
 }

}