public class IncThread extends Thread
{
	private static int sum;
	
	public void run()
	{
		sum++;
	}
	
	public static void main(String[] args)
	{
		IncThread[] threads = new IncThread[50];
		for(IncThread thread : threads)
		{
			thread = new IncThread();
			thread.start();
		}
		
		System.out.println("Sum: " + sum);
	}
}