I'm afraid not. For each adult, standard-sized hen you need:
4 square feet in the coop,
10 square feet in the run,
1 linear foot of roost,
And 1 square foot of permanent, 24/7/365 ventilation, preferably located over the birds' heads when they're sitting on the roost.
That means that for a flock of three you need at least 12 square feet in the coop -- 3'x4' -- and 30 square feet in the run -- 4'x8' or 5'x6' -- with 3 linear feet of roost (above the level of the nest boxes), and 3 square feet of ventilation.
A lot of people have converted their prefab coop-and-run-combinations as
@MissE suggested. Here's a thread detailing one of these projects:
https://www.backyardchickens.com/threads/my-renovated-prefab-coop.1440258/