How to calculate probability of making $80 on 1000 sequential bets under the following conditions: (1) unlimited funds (2) bankroll of $256...

How to calculate probability of making $80 on 1000 sequential bets under the following conditions: (1) unlimited funds & (2) bankroll of $256 utilizing martingale betting strategy.

Details of betting strategy:

Always bet on black (18/38) chance of winning.

bet amount $1

if win continue to bet $1

if lose double bet until you win.