Luca goes to report the theft of his wallet immediately in a very crowded subway. He recalls that before leaving the house he had counted the money and that he had € 520 in all; he also knows that he had € 50 and € 20 banknotes and that the number of banknotes of the second type were 2 less than those of the first. Luckily he had put half of the € 50 bills in the inside pocket of his purse, thus saving them from theft. How many banknotes of each type did he has and how much money did he manage to save?