average

#include <iostream>
#include <algorithm>
#include <bits/stdc++.h>
using namespace std ;
typedef long long ll ;

 void ABDEL3AL () {
     ios_base::sync_with_stdio(false) , cin.tie(nullptr) , cout.tie(nullptr) ;
     #ifndef ONLINE_JUDGE
     freopen("input.txt" , "r" ,stdin) , freopen("output.txt" , "w" , stdout) ;
     #endif
}

float average (double arr[] , int n) {
     float sum = 0 ;
     for (int i = 0; i < n; i++) sum += arr[i] ;
    return sum / n ;
 }


int main() {
    ABDEL3AL() ;
    int n ;
    cin >> n ;
    double arr[n] ;
    for (int i = 0; i < n && cin >> arr[i]; i++);
    cout << fixed << setprecision(6) << average(arr , n) ;


    return 0;

}