Теплотрасса

#include <iostream>
#include <conio.h>
#include <string>
#include <set>
#include <map>
#include <algorithm>
#include <string>
#include <math.h>
#include <vector>

using namespace std;

int main()
{
    long long prom;
    double result, sum = 0, n;

    cin >> n;
    cout.setf(ios::fixed);
    cout.precision(6);
    for (int i = 1; i <= n; i++)
    {
        cin >> prom;
        sum = sum + prom;
    }

    result = (sum*2.0) / (n * 2.0);
    cout << result;

    _getch();
    return 0;
}