CSharpTask

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

namespace CSharpLightTask
{
    class Program
    {
        static void Main(string[] args)
        {
            int number = InputNumber(Console.ReadLine());
            Console.WriteLine(number);
            Console.ReadKey();
        }

        static int InputNumber(string number)
        {
            int resultNumber = 0;
            bool execute = true;
            while (execute)
            {
                if (int.TryParse(number, out int result))
                {
                    resultNumber = result;
                    execute = false;
                }
                else
                {
                    Console.Write("Введите число: ");
                    number = Console.ReadLine();
                }
            }
            return resultNumber;
        }

    }
}