Beer Stock

function beerStock(input) {
    let neededBeers = Number(input[0]);
    let deliveredBeers = 0, index = 1;
    let command;

    while ((command = input[index++]) != "Exam Over") {
        var package = command.split(' ');
        let amount = Number(package[0]);
        let type = package[1];

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

    deliveredBeers -= parseInt(deliveredBeers / 100);
    let diff = Math.abs(neededBeers - deliveredBeers);
    let cases = parseInt(diff / 24);
    let sixpacks = parseInt(diff % 24 / 6);
    let beers = parseInt(diff % 6);

    if (deliveredBeers >= neededBeers) {
        console.log(`Cheers! Beer left: ${cases} cases, ${sixpacks} sixpacks and ${beers} beers.`);
    } else {
        console.log(`Not enough beer. Beer needed: ${cases} cases, ${sixpacks} sixpacks and ${beers} beers.`);
    }
    return;
}