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What a clumsy Loki you are, you forgot that you also need to get some snacks for those 70 rubles, otherwise, you'll only have 50 rubles left for a decent beer. I can't stand cheap light beer; it tastes like urine. But yes, draft beer or some dark beer, like Kozel, would be good. Tuborg Black is also terrible, and it tastes like cola. As another good option, you could get two Siberian Crowns, but then you won't have any money left for snacks, and I'm not sure if it's cheaper than 30 rubles in other regions besides Omsk.