using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static int Main()
        {
            bool onOffRbez = true;
            string inputLine1Rbez;
            int inputLine1VarRbez;
            string inputLine2Rbez;
            int inputLine2VarRbez;
            int answerVarRbez;
            string answerRbez;
            string inputExitRbez;
            int inputExitVarRbez = 2;
            while (onOffRbez == true)
            {
                try
                {
                    Console.WriteLine("Type first number of sum");
                    inputLine1Rbez = Console.ReadLine();
                    inputLine1VarRbez = Convert.ToInt32(inputLine1Rbez);
                    Console.WriteLine("Type second number of sum");
                    inputLine2Rbez = Console.ReadLine();
                    inputLine2VarRbez = Convert.ToInt32(inputLine2Rbez);
                    answerVarRbez = inputLine1VarRbez + inputLine2VarRbez;
                    answerRbez = Convert.ToString(answerVarRbez);
                    Console.WriteLine(inputLine1Rbez + "+" + inputLine2Rbez + "=" + answerRbez + Environment.NewLine);
                    Console.WriteLine("Press 1 to continue press 0 to exit");
                    inputExitRbez = Console.ReadLine();
                    inputExitVarRbez = Convert.ToInt32(inputExitRbez);
                    if (inputExitVarRbez == 1)
                    {
                        Console.Clear();
                    }
                    else
                    {
                        onOffRbez = false;
                    }
                    
                }
                catch
                {
                    Console.WriteLine("U can only use numbers! Press enter to try again.");
                    Console.ReadKey();
                    Console.Clear();
                    onOffRbez = false;
                    onOffRbez = true;
                }

            }
            return 0;
             

        }

    }
}