How many rubles should I take along for a 1 month stay in St. Petersburg Russia?

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Hi! Im undergoing CLL when Im 20 or 21 and I have calculated the cost of surgery to be around 487,020 rubles. Excluding accomadation, which I plan on finding a hotel around 3000 rubles daily with a built in kitchen so I can cook, I plan on bringing out around 500000 rubles ( the max amt carried in cash to Russia) and spending it for the whole of my stay.

Question is, is 500000 rubles enough? Id hate to have to use my credit card or go into debt in Russia.

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Thanks, I might pay with credit. Just that the doccuments mailed to me by Dr kuleesh and Dr Solomin said something about paying 400000 in cash.