Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
Noemi lost $400 on roulette and $500 on blackjack. How much money did Noemi begin with if she still had $800 in her purse?

### Response:
 เนอสูญเสียเงิน $400+$500=$<<400+500=900>>900
ถ้าเธอยังเหลือ $900 เธอเริ่มต้นมีเงิน $900+$800=$1700