using System;

public class Program

{

    public static void Main()

    {

        int n;

            Console.WriteLine("Nhap so nguyen duong n: ");

            n = Convert.ToInt32(Console.ReadLine());

            int S = 0, a;

            while(n>0)

            {

                a = n % 10;

                if(a%2==0)

                {

                    S += a;

                }

                n=n / 10;

            }

            Console.WriteLine($"Tong cac chu so chan trong so nguyen duong n la {S}");

    }

}