login credentials

Question

i have the following code

how can i get the second user to login successfully

public static void Main(string[] args)
{
string username = "alex";
string password = "sunshine";
string username2 = "emma";
string password2= "haskell";
Console.WriteLine("Enter username:");
string input = Console.ReadLine();
Console.WriteLine("Enter password:");
string input2 = Console.ReadLine();
if (username == input)
{
if (password == input2)
{
if (username2==input)
{
if (password2==input2)
{
Console.Write("You have successfully logged in!");
}
}
}
}
else
{
Console.Write("Incorrect username or password!");
}