using System;

​

namespace Bai44

{

    class Program

    {

        static void Main()

        {

            int n;

            Console.Write("Nhap vao n = ");

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

            double soMu;

            soMu = Math.Log10(n);

            double tong = 0;

            int a;

            while(n > 0)

            {

                a = n % 10;

                n = n / 10;

                tong += a * Math.Pow(10, soMu);

                soMu--;

            }

            Console.WriteLine($"So dao nguoc cua {n} la {tong}");

        }

    }

}

​