#include<iostream>
using namespace std;
 class statistics{
     double mean;
     public:
     statistics(int[],int n ){
         double sum =0;
         for(int i=0; i<n;i++){
             sum +=arr[i];
            
         }
         mean= sum/n;
     }
     statistics(const statistics &obj){
         mean=obj.mean;
     }
     void display(){
         cout<<mean;
     }
 };
 int main(){
     int n;
     cin >>n;
     if (n<0){
         cout<"Invalid input";
         return 0;
     }
     int arr[n];
     for (int i=0;i<n;i++){
         cin>>arr[i];
     }
 statistics s1(arr,n);
 statistics s2= s1;
 s2.display();
 return 0;
 }