public class MechanicalCounter{

public int amountWear(int start, int finish){
	Integer sta = new Integer(start);
	Integer fin = new Integer(finish);
	int counter =0;
	for (int i=start;i<finish;i++)
	{
		int xor = start^finish;
		counter += Integer.bitCount(xor);	
	}
	return (counter);
}
}