using System;

public class Program

{

    public static int Add (int a, int b)

    { 

        return a + b;

    }

    public static void Main()

    {

        Console.WriteLine("Welcome to ICBC!");

        Console. WriteLine(" Please input your account number:");

        int account = int.Parse(Console.Read());

        Console. WriteLine (" please input your password:");

        int password = int.Parse(Console. Read());

        if ( account == 98765 && password ==12345)

        {Console.WriteLine("Log in susscessfully!");

        Console.WriteLine(" Please choose the service: 1. check account  2. show balance  3. deposit  4. withdraw  5. log out");

        int service = int.Parse(Console.ReadLine());}

    }

}

​