Beer Stock

#include <iostream>
#include <string>
#include <cmath>

using namespace std;

int main() {
    int neededBeers;
    cin >> neededBeers;
    cin.ignore();

    long deliveredBeers = 0;
    string command;
    getline(cin, command);

    while (command != "Exam Over") {
        int index = command.find(' ');
        long amount = stoi(command.substr(0, index));
        string type = command.substr(index + 1, command.length() - index);

        if (type == "sixpacks") {
            amount *= 6;
        }
        else if (type == "cases") {
            amount *= 24;
        }
        deliveredBeers += amount;
        getline(cin, command);
    }

    deliveredBeers -= deliveredBeers / 100;
    long diff = abs(neededBeers - deliveredBeers);
    long cases = diff / 24;
    long sixpacks = diff % 24 / 6;
    long beers = diff % 6;

    if (deliveredBeers >= neededBeers) {
        printf("Cheers! Beer left: %i cases, %i sixpacks and %i beers.", cases, sixpacks, beers);
    }
    else {
        printf("Not enough beer. Beer needed: %i cases, %i sixpacks and %i beers.", cases, sixpacks, beers);
    }
    return 0;
}