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 $n$ ( $1<=n<=100$ ) — the number of orange-containing drinks in Vasya's fridge. The second line contains $n$ integers $p_{i}$ ( $0<=p_{i}<=100$ ) — the volume fraction of orange juice in the $i$ -th drink, in percent. The numbers are separated by a space.

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.