#include<iostream>
#include<vector>
using namespace std;
class Statistics
{
    private:
    double mean;
    public:
    Statistics(int n,const vector<int>&data)
    {
        if(n==0){
            mean=0;
            return;
        }
        double sum=0;
        for(int val:data)
        {
            sum+=val;
        }
        mean=sum/n;
    }
        Stastistics(const statistics &other)
        {
            this->mean=other.mean;
        }
        const{
            cout<<mean<<endl;
        }
};
int main(){
    int n;
    if(!(cin>>n))return 0;
    if(n<0){
        cout<<"Invalid input"<<endl;
    }
    else{
        vector<int>data(n);
        for(inti=0;i<n;i++){
            cin>>data[i];
        }
        Statistics stats(n,data);
        Statistics copiedStats=stats;
        copiedStats.displayMean();
    }
    return 0;
}