using System;

public class Program

{

    public static void Main(string [] args)

    {

        Console.Write("Enter the amount of number you want to sum:");

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

        int s =0;

        for( int t =1; t<=n; t++){

    Console.Write("Enter a number:");

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

            while(number > 0)

            {

                s+=number % 10;

                number = number / 10;

            }

        } 

        Console.WriteLine("The sum of the digits of all the number is " + s);

}

}

​