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import java.util.concurrent.TimeUnit;

import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.ReentrantLock;

class Counter{

private Lock lock = new ReentrantLock();

private int value = 0;

public void add(int m){

lock.lock();

try{

this.value += m;

}

finally {

lock.unlock();

}

}

public void inc() throws InterruptedException {

if(lock.tryLock(1, TimeUnit.SECONDS)){

try{

this.value += 1;

}

finally {

lock.unlock();

}

}

}

public void dec(int m){

lock.lock();

try{

this.value -= m;

}

finally {

lock.unlock();

}

}

public int get(){

lock.lock();

try{

return this.value;

}

finally {

lock.unlock();

}

}

}

public class Main2 {

final static int LOOP = 1000;

public static void main(String[] args) throws InterruptedException {

final Counter counter = new Counter();

Thread t1 = new Thread(){

@Override

public void run() {

for(int i = 0; i < LOOP; i++){

counter.add(1);

}

}

};

Thread t2 = new Thread(){

@Override

public void run() {

for(int i = 0; i < LOOP; i++){

counter.dec(1);

}

}

};

t1.start();

t2.start();

t1.join();

t2.join();

System.out.println(counter.get());

System.out.println("END");

}

}