Easter Decoration

function easterDecoration(input) {
    let clients = Number(input.shift());
    let total = 0;

    for (let i = 0; i < clients; i++) {
        let stock = input.shift();
        let counter = 0;
        let sum = 0;

        while (stock !== "Finish") {
            switch (stock) {
                case "basket":
                    sum += 1.5;
                    break;

                case "wreath":
                    sum += 3.8;
                    break;

                case "chocolate bunny":
                    sum += 7;
                    break;
            }
            stock = input.shift();
            counter++;
        }

        if (counter % 2 === 0) {
            sum *= 0.8;
        }

        total += sum;
        console.log(`You purchased ${counter} items for ${sum.toFixed(2)} leva.`);
    }
    console.log(`Average bill per client is: ${(total / clients).toFixed(2)} leva.`);
}