#include<iostream>
#include<iomanip>
#include<math.h>
using namespace std;
int main()
{
    int n;  
    cin >> n;
    double a,b,c;
    for (int i =1; i<=n;i++)
    {
        cin >>a;
        b+=a;
    }
    c=b/n;
    printf("%.2lf",c);
}

#include <stdio.h>
#include <iostream>
using namespace std;
int main()
{
	double n,sum = 0,x;
    cin >> n;
    for (int i = 0 ; i < n; i++)
    {
        cin >> x;
        sum += x;
    }
    printf("%.2lf\n",sum/n);
}

a