#include <iostream>
#include<iomanip>
using namespace std;
struct average{
    int a;
    int *marks;
};
float calavg(int a,int mark[]){
     int sum=0;
     for(int i=0;i<a;i++)
     {
         sum+=mark[i];
     }
    double avg=(float)sum/a;
    return avg;
}
int main() {
    average s;
    cin>>s.a;
    s.mark=new int[s.a];
    for(int i=0;i<s.a;i++)
    {
        cin>>s.marks[i];
    }
    float avg=calavg(&s);
    cout<<avg;
return 0;
}