CodeForces 200B Drinks

最新推荐文章于 2021-11-10 17:40:48 发布

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本文介绍了一个简单的算法，用于计算由多种含有橙汁的饮料混合而成的鸡尾酒中橙汁的比例。通过输入每种饮料中橙汁的百分比含量，算法能够计算出最终鸡尾酒中橙汁的总体积比例。

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 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 exceed10 ^- 4.

Examples

Input

3
50 50 100

Output

66.666666666667

Input

4
0 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 $\text{[math]}$ milliliters. The total cocktail's volume equals3·x milliliters, so the volume fraction of the juice in the cocktail equals $\text{[math]}$ , 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;   
}