I'm guessing that's around 10 US gallons. If you've already bought them, then oh well.
However, I disagree with what was just said. You should have waited for more people to answer. It's best to start of with less fish to make sure the fish don't die because of high ammonia levels. You should have added one or two females, then one male a month or so later. 2 females to 1 male is a good ratio, though 3:1 is better. You have to make preparations for the babies, though, because you will not be able to handle the fry from even one female, let alone three!