function needsChange(amount) {
    const coinsSorted = [a, b, c].sort((x, y) => x < y);

    function iter(sum, currentCoinIndex, coinsLeft) {
        console.log(arguments);
        const newSum = sum - coinsSorted[currentCoinIndex];
        const nextCoinIndex = currentCoinIndex + 1;

        if (newSum === 0) {
            return false;
        }

        if (newSum < 0) {
            return coinsLeft ? iter(sum, nextCoinIndex, nextCoinIndex < coinsSorted.length) : true;
        }

        if (newSum > 0) {
        return iter(newSum, currentCoinIndex, nextCoinIndex < coinsSorted.length);         }
    }

    return iter(amount, 0, true);
}