#include <iostream>
#include<iomanip>
using namespace std;
int calavg(int a,int mark[]){
     int sum=0;
     for(int i=0;i<a;i++)
     {
         sum+=mark[i];
     }
     double avg=(float)sum/a;
     cout<<"using function"<<endl;
     cout<<fixed<<setprecision(3)<<avg;
}
int main() {
     int a;
     cin>>a;
     int mark[a];
     for(int i=0;i<a;i++)
     {
         cin>>mark[i];
     }
     calavg(a,mark);
     int sum=0;
     for(int i=0;i<a;i++)
     {
         sum+=mark[i];
     }
     double avg=(float)sum/a;
     cout<<"normal method";
     cout<<fixed<<setprecision(3)<<avg;
return 0;
}