Codeforces 200B - 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 pi 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.
Input:
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 pi (0 ≤ pi ≤ 100) — the volume fraction of orange juice in the i-th drink, in percent. The numbers are separated by a space.
Output:
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.
範例:
input:
1 | 3 |
output:
1 | 66.666666666667 |
input:
1 | 4 |
output:
1 | 37.500000000000 |
Note:
題意:
有n種飲料，第i種飲料的柳橙汁含量比例是百分之pi。現在將n種飲料等比例的混合做成綜合柳橙汁，最後的柳橙汁含量百分比是多少？
思路:
加總平均。