How to limit Apify web crawler scope to first three list pages?

I have written the following web scraper in Apify (jQuery), but I am struggling to limit it to only look at certain list pages. The crawler scrapes articles I have published at, a page which contains 102 paginated index pages, each containing 20 article links. The crawler works fine when executed manually and in full; it gets everything, 2,000+ articles. However, I wish to use Apify’s scheduler to trigger an occasional crawl that only scrapes articles from the first three of those index (LIST) pages (ie. 60 articles). The scheduler uses cron and allows the passing of settings via