function solve(input) {
    let notEnoughMoney = false;
    let itemCounter = 0;
    let index = 0;
    let sumAllItems = 0;
    let diff = 0;

    let budget = Number(input[index]);
    index++;

    while (budget > 0) {
        let item = input[index];

        if (item === "Stop") {
            break;
        }
        index++;

        let itemPrice = Number(input[index]);
        index++;

        itemCounter++;

        if (itemCounter % 3 === 0) {
            itemPrice *= 0.5;
        }

        budget -= itemPrice;
        sumAllItems += itemPrice;

        if (budget < 0) {
            diff = Math.abs(budget);
            notEnoughMoney = true;
            break;
        } else if (budget === 0) {
            break;
        }
    }
    if (notEnoughMoney) {
        console.log("You don't have enough money!");
        console.log(`You need ${diff.toFixed(2)} leva!`);
    } else {
        console.log(
            `You bought ${itemCounter} products for ${sumAllItems.toFixed(2)} leva.`
        );
    }
}