07. Moving

#include <iostream>
#include <string>

using namespace std;

int main() {
    int width, length, height;
    cin >> width >> length >> height;

    int freeSpace = width * length * height;

    string box;

    while (freeSpace > 0) {
        cin >> box;

        if (box == "Done") {
            break;
        }

        freeSpace -= stoi(box);
    }

    if (box == "Done") {
        cout << freeSpace << " Cubic meters left.\n";
    }
    else {
        cout << "No more free space! You need " << abs(freeSpace) << " Cubic meters more.";
    }

    return 0;
}