FTP Iron Man challenge: moving up & down

[PietM]

I've tried to search for the answer to this, but couldn't find it here or on FTP.

If I make the Gold level four months in a row, I understand that I get 100 medals in the fourth month.

But what happens if I make the Silver level in month one, then go on to the Gold level in months two and three, and then go back to the Silver level in month four?