Lucky 13 - Java

gistfile1.java

import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Scanner;

public class Lucky
{
  public static int winnings(int bet) throws Exception
  {
    return "13".equals(new Scanner(((InputStream) new URL("http://roulette.engineyard.com/").getContent())).findInLine("\\d+")) ? bet * 35 : 0;
  }
}