200B

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int i,n;
    double arr[102],sum=0;
    cin>>n;
    for(i=0; i<n; i++)
    {
        cin>>arr[i];
        sum=sum+arr[i];
    }
    double ans;
    ans=((sum*100)/(n*100));
    cout<<fixed<<setprecision(12)<<ans<<endl;

    return 0;

}