According to the judiciary act of 1789, how many chief justices were allocated to the supreme court?

The Judiciary Act of 1789 made allocated Six justices to the Supreme Court. This six judge system lasted until 1807. At this time, Congress increased the number to seven. In 1837, the number of Supreme Court justices was then increased to nine. The amount of judges would change several more times before it was officially decided that this branch would have nine judges (like it does today).