using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello what is your name?");

        string user = Console.ReadLine();

        string pass = Console.ReadLine();

        bool ne = true;

        /*if(accList(user, pass))

           {

           }*/

        string[,] arrays = new string[,] { {"admin","admin2","admin3" },{"123","1234","12" } };

          int j =0; 

        int i = 0;

        for(i = 0;i<arrays.GetLength(0)&& arrays[0, i] != user && arrays[1, i] != pass;i++ )

        {

             for( j = 0; j<arrays.GetLength(1)  && arrays[0, j] != user && arrays[1, j] != pass; j++ ) 

            { 

                   Console.WriteLine(arrays[0, j]);

                    ne = false;

                }

            if( j==arrays.GetLength(1)-1 && j==arrays.GetLength(0)-1){

                break;

            }

        }

        if( j<arrays.GetLength(1) && i<arrays.GetLength(0))

                  {

                    if(arrays[0, j] == user&& arrays[1, j] == pass){

                        ne = true;  

                    }

                  } else{

            ne=false;

        }

        if(ne == true)

                    {

                        Console.WriteLine("hi "+ user);

                    }else if(ne == false){

                        Console.WriteLine("Your input is not valid ");

                        }

    }

    public static bool accList(string un, string pass)

        {

​

            string[,] arrays = new string[,] { { },{ } };

            arrays[0, 0] = "admin";

            arrays[0, 1] = "123";

            arrays[1, 0] = "admin2";

            arrays[1, 1] = "12345";

            for(int i = 0; i<arrays.GetLength(0); i++ ) 

            { 

              for(int j = 0; j<arrays.GetLength(1); j++ ) 

            { 

                 for(int k = 0; arrays[k, k] != un&& arrays[k, 1] != pass; k++ ) { 

                    }

                 }

            }

            return false;

        }

}