For this chain-of-thought reasoning and answer, what was the question?
Purity will pay a third of Rose's share, which translates to 1800 / 3 = 600 dollars. Sheila has offered to pay 5 * 600 = 3000 dollars. Combining everyone’s share of the rent will give a total of 600 + 3000 + 1800 = 5400 dollars.
 A: 5400

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Q: Sheila, Purity, and Rose want to rent a house. Sheila has offered to pay five times Purity’s share of the rent. Rose can only afford thrice what Purity pays. If Rose’s share is $1,800, what is the total house rent?