using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string numbers = "1 + 1, 2 - 1, 3 + 3";

        var newnumber = string.Join(", ",numbers.Split(',')

            .SelectMany(x => x.Trim().Split(' '))

            .Select((x,i) => new {Index = i, Value = x })

            .GroupBy(x => x.Index/3, i => i.Value)

            .Select(x => {

                switch(x.ElementAt(1)){

                    case "+": return int.Parse(x.ElementAt(0)) + int.Parse(x.ElementAt(2));

                    case "-": return int.Parse(x.ElementAt(0)) - int.Parse(x.ElementAt(2));

                    case "/": return int.Parse(x.ElementAt(0)) / int.Parse(x.ElementAt(2));

                    case "*": return int.Parse(x.ElementAt(0)) * int.Parse(x.ElementAt(2));

                    default: return 0;

                }

            }));

        Console.WriteLine(newnumber);

    }

}