//3

using System;

class Fraction{

    public int mona;

        public int mahana;

}

Fraction Issever(int mona, int mahana){ 

    Fraction Issever=null;

    Console.WriteLine("");

    mona= int.Parse(Console.ReadLine());

    Console.WriteLine("");

    mahana= int.Parse(Console.ReadLine());

    if (mahana==0){

        Issever

​