Topofone number of tokens issue

Hi guys,

Hope it's not a repost, and also hope I'm not stupid :D but I'm missing something:

So, the Topofone contract gives you 3 tokens each for days, assuming you re-sign with Topofone.

But it is available only from day 7 to day 28. So, you will get the tokens in the following days

1. Day 7

2. Day 11

3. Day 15

4. Day 19

5. Day 23

6. Day 27

So you will sign the contract 6 times, getting 3 tokens for each sign, meaning a total of 18 tokens.

My question is how do you get 21 tokens, as they say.

Thank you