// editor2
#include<iostream>
using namespace std;
class Statistics
{
    public:
    Statistics(int arr[], int n)
    {
        int sum=0;
        for(int i=0;i<n;i++)
        {
            sum+=arr[i];
        }
        mean=(float)sum/n;
    }
    Statistics(Statistics &s)
    {
        mean =s.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);
    cout<<s2.mean;
    return 0;
    
}