CF200B Drinks

Little Vasya loves orange juice very much. That's why any food and drink in his kitchen necessarily contains orange juice. There are $ n $ drinks in his fridge, the volume fraction of orange juice in the $ i $ -th drink equals $ p_{i} $ percent. One day Vasya decided to make himself an orange cocktail. He took equal proportions of each of the $ n $ drinks and mixed them. Then he wondered, how much orange juice the cocktail has. Find the volume fraction of orange juice in the final drink.

The first input line contains a single integer $ n $ ( $ 1

Print the volume fraction in percent of orange juice in Vasya's cocktail. The answer will be considered correct if the absolute or relative error does not exceed $ 10^{-4} $ .

Note to the first sample: let's assume that Vasya takes $ x $ milliliters of each drink from the fridge. Then the volume of pure juice in the cocktail will equal  milliliters. The total cocktail's volume equals $ 3·x $ milliliters, so the volume fraction of the juice in the cocktail equals , that is, $ 66.(6) $ percent.