#include <iostream>

#include <cmath>

#include <cstring>

#include <string>

#include <iomanip>

#include <algorithm>

#include <stack>

#include <fstream>

using namespace std;

void FileTest()

{

    ifstream in;

    ofstream out;

    in.open("in.txt");

    out.open("out.txt");

    int n;

    float t,sum=,ave;

    in>>n;

    for(int i=;i<n;i++)

    {

        in>>t;

        sum+=t;

    }

    ave=sum/n;

    out<<ave;

    in.close();

    out.close();

}

int main()

{

    FileTest();

    cout << "Hello C++\n";

    return ;

}