import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class Bank {
    int pengebelop = 100;
    Lock laas = new ReentrantLock();
    Condition pengerIBanken = laas.newCondition();

    public void ta(int b) throws InterruptedException {
        laas.lock();
        try {
            while (pengebelop < b) {
                pengerIBanken.await();
            }
            pengebelop -= b;
        } finally {
            laas.unlock();
        }
    }

    public void gi(int b) {
        laas.lock();
        try {
            pengebelop += b;
            pengerIBanken.signalAll();
        } finally {
            laas.unlock();
        }
    }

    public int saldo() {
        laas.lock();
        try {
            return pengebelop;
        } finally {
            laas.unlock();
        }
    }
}