CodeForces 200B Drinks

B. Drinks

time limit per test

2 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

Little Vasya loves orange juice very much. That's why any food and drink in his kitchen necessarily contains orange juice. There aren drinks in his fridge, the volume fraction of orange juice in thei-th drink equals p_i percent.

One day Vasya decided to make himself an orange cocktail. He took equal proportions of each of then 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 containsn integers p_i (0 ≤ p_i ≤ 100) — the volume fraction of orange juice in thei-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 exceed10 ^- 4.

Examples

Input

350 50 100

Output

66.666666666667

Input

40 25 50 75

Output

37.500000000000

Note

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 equals3·x milliliters, so the volume fraction of the juice in the cocktail equals, that is,66.(6) percent.

#include<iostream>   #include<cstdio> #include<algorithm>  using namespace std;     int main(){  int n,i;float hello,t,sum;while(cin>>n){sum=0;for(i=0;i<n;i++){cin>>t;sum+=t;}hello=sum/n;printf("%.12lf\n",hello);}    return 0;   }