#include<iostream>
using namespace std;

class Statistics{
    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[n];
    for(int i=0;i<n;i++)
    {
        cin>>arr[i];
    }
    Statistics_s1(arr,n);
    Statistics s2=s1;
    s2.display();
    return 0;
}