Contest Win Laddus

Does contest win Laddus imply one has to be in top 3 of the rated contest ?
The formula claims Laddus=300+Bonus
Where Bonus=21-n where n is the rank for long contest , so does it mean one has to be among top 21 ?

Top 20. Its written in the post here - https://discuss.codechef.com/questions/51999/how-do-i-win-a-codechef-goodie/52066

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