const int K = 11;
int n;
semaphore counter;
int i;


void A ()
{
        if (n == 0) {
                wait(counter);
        } else {
                n--;
        }
        cout << "\nA RUNS AND N IS " << n << "\n";
}

void B ()
{
        signal(counter);
        n++;
        cout << "\nB RUNS AND N IS " << n << "\n";
}


main()
{
        n = 0;
        initialsem(counter,0);
        cobegin
        {
                for (i = 0; i<K; i++)
                {
                        A(); B();
                }
        }

        cout << "The sum is " << n << endl;
}