Extreme case:
Minimum price (for insiders) = $14.
With investment of 5K = # of shares = 5000/14 = ~357 shares
Best selling price = went up to highest $29 per share
So, the best cost basis income = 357 x $29 = ~ $10,357.

Therefore, you analyze now what is the maximum income one could have made from the 5k investment in Snapchat. So, try to understand the realistic market.