#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
    int n;  
    cin >> n;
    double num,sum,avrage;
    for (int i = 1; i <= n; i++)
    {
        cin >> num;
        sum += num;
    }
    avrage = sum/n;
    printf("%.4lf",avrage );
}