#include <iostream>
using namespace std;
class Statistics{
    private:
    double mean;
    public:
    Statistics(int arr[], 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[100];
    for(int i=0;i<n;i++){
        cin>>arr[i];
    }
    Statistics original(arr,n);
    statistic copied(original);
    copied.display();

    return 0;
}