#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
	int n;  
    cin>>n;
    double num,sum,avrage;
    for (int i=1;i<=n;i++)
    {
        cin>>num;
        sum+=num;
    }
    avrage=sum/n;
    printf("%.4lf",avrage );
}