count in order according to class - with counter

HTML

<ul>
    <li class="count">one</li>
    <li class="count">two</li>
    <li class="count">three</li>
    <li class="count">four</li>
    <li>blabla</li>
    <li class="count">five</li>
    <li class="count">six</li>
    <li>blabla</li>
    <li class="count">seven</li>
</ul>

CSS

ul {
    list-style-type:decimal;
    padding-left: 30px;
}
li:not(.count) {
    display: block;
}