No no no, you're all doing it wrong.
Ok, so, 2 ships.
1 really big asteroid, the other ship gets hit by it, that leaves us with 1.
Some more asteroids (5) plus 1 = 6.
Let's take the asteroids home with the ship, ok?
Wow the station looks like number 16. That leaves us with 6 + 16.
Hmm one...