11. Math operations

using System;

namespace MathOperations
{
    class Program
    {
        static void Main(string[] args)
        {
            int num1 = int.Parse(Console.ReadLine());
            string operat0r = Console.ReadLine();
            int num2 = int.Parse(Console.ReadLine());

            Calculate(num1, operat0r, num2);
        }

        static int Calculate(int num1, string operat0r, int num2)
        {
            int sum = 0;
            switch (operat0r)
            {
                case "+":
                    sum = num1 + num2;
                    break;
                case "/":
                    sum = num1 / num2;
                    break;
                case "*":
                    sum = num1 * num2;
                    break;
                case "-":
                    sum = num1 - num2;
                    break;

            }
            Console.WriteLine(sum);
            return sum;
        }
    }
}