using System;

public class Program

{

    public static void Main()

    {

        var gameId = "4";

        var paddedGameId = $"100{gameId.PadLeft(3, '0')}";

        Console.WriteLine(gameId + " - " + paddedGameId);

        gameId = "41";

        paddedGameId = $"100{gameId.PadLeft(3, '0')}";

        Console.WriteLine(gameId + " - " + paddedGameId);

        gameId = "411";

        paddedGameId = $"100{gameId.PadLeft(3, '0')}";

        Console.WriteLine(gameId + " - " + paddedGameId);

    }

}