Five reais is enough to buy a 250ml cup of guaraná and six little packages of peanuts in the train in Rio. Alternatively, you could change those six peanut thingies for a sweet or a bootleg copy of potato chips or other types of brazilian junk food, they evel sell fried cow skin in the train, which goes for 2 reais. People who were born in the 90's still remember fondly how you could buy guaraná for just one real, with the price having doubled in the last twenty years, that, friends, is the real tragedy of Brazil.