Bet A = Your beginning bet. You can, for example, set your beginning bet to win $100 when you first start out
Bet B = In case Bet A fails, you make bet B to make up for any loss you’ve suffered from Bet A, plus any profit you would have achieved from bet A. So, if your to-win Bet A was $100, your to-win Bet B can be $200
Bet C = In case Bet B fails, you make bet C to make up for any loss you’ve suffered from Bet A plus Bet B, plus profit you would have achieved from bet A. So, if your to-win
Bet A plus Bet B was $300, your to-win Bet C can be $400
There is no Bet D, or E, or anything thereafter. If you lose Bet C, you lose the bet.