04. Cake

#include <iostream>
#include <string>

using namespace std;


int main()
{
    int height_of_cake, width_of_cake;
    cin >> width_of_cake >> height_of_cake;
    int number_of_pieces = width_of_cake * height_of_cake;
    string current_input;
    cin >> current_input;
    bool cake_is_over = false;

    while (current_input != "STOP")
    {
        int current_pieces_to_take = stoi(current_input);
        if (current_pieces_to_take > number_of_pieces)
        {
            cake_is_over = true;
            int needed_pieces = current_pieces_to_take - number_of_pieces;
            cout << "No more cake left! You need "
                << needed_pieces
                << " pieces more."
                << endl;
            break;
        }
        else
        {
            number_of_pieces -= current_pieces_to_take;
        }
        cin >> current_input;
    }

    if (!cake_is_over)
    {
        cout << number_of_pieces << " pieces are left." << endl;
    }

    return 0;
}