[max1985]

Здравствуйте!
Есть скрипт который позволяет выбрать диапазон дней для расчета программы питания

var firstDay = 0;
var lastDay = 6;
$('.builder-days-selector a').on('click', function(event) {
    var active = $('.builder-days-selector').find('.active').length;

    if (active === 0) {
        $(event.target.closest('a')).addClass('active');
        firstDay = $(event.target.closest('a')).attr('data-slide-index');
    } else if (active === 1) {
        lastDay = firstDay;
        $(event.target.closest('a')).attr('data-slide-index') > firstDay
            ? lastDay = $(event.target.closest('a')).attr('data-slide-index')
            : firstDay = $(event.target.closest('a')).attr('data-slide-index');

        for (var i = firstDay; i <= lastDay; i++) {
            $("a[data-slide-index=" + i + "]").addClass('active');
        }
    } else {
        $('.builder-days-selector a').removeClass('active');
        $(event.target.closest('a')).addClass('active');
        firstDay = $(event.target.closest('a')).attr('data-slide-index');
        lastDay = firstDay;
    }
});

<div class="custom-pager builder-days-selector">
            <a class="active" data-slide-index="0"> <!--                class = "active"-->
                <span class="pager-title">
                    Пн
                </span>
                <span class="circle">
                    <span class="inner-circle"></span>
                </span>
            </a>

            <a class="active" data-slide-index="1">
                <span class="pager-title">
                    Вт
                </span>
                <span class="circle">
                    <span class="inner-circle"></span>
                </span>
            </a>

            <a class="active" data-slide-index="2">
                <span class="pager-title">
                    Ср
                </span>
                <span class="circle">
                    <span class="inner-circle"></span>
                </span>
            </a>

            <a class="active" data-slide-index="3">
                <span class="pager-title">
                    Чт
                </span>
                <span class="circle">
                    <span class="inner-circle"></span>
                </span>
            </a>

            <a class="active" data-slide-index="4">
                <span class="pager-title">
                    Пт
                </span>
                <span class="circle">
                    <span class="inner-circle"></span>
                </span>
            </a>

            <a class="active" data-slide-index="5">
                <span class="pager-title">
                    Сб
                </span>
                <span class="circle">
                    <span class="inner-circle"></span>
                </span>
            </a>

            <a class="active" data-slide-index="6">
                <span class="pager-title">
                    Вс
                </span>
                <span class="circle">
                    <span class="inner-circle"></span>
                </span>
            </a>
        </div>

Как его переделать чтоб можно было выбирать только конкретные дни?
Спасибо!