Dylan has 4 siblings, and he's the oldest. Dylan and his siblings get some extra cash from their parents every week. 2 times the 2nd child's extra cash is as same as Dylan's. 3 times the 3rd child's extra cash is as same as Dylan's. 4 times the 4th child's extra cash is as same as Dylan's. 5 times the 5th child's extra cash is as same as Dylan's. Dylan siblings are Cindy and Ben, last week Ben was jealous to Cindy because Cindy's extra money is bigger than his. So, how much is the smallest possible value of Dylan's extra cash in a month?
