#include <iostream>
#include <iomanip>
using namespace std;
class Rainfall{
private:
   static n;
   static double total;
public:
    static void valculate(){
        if(!(cin>>n)){
            cout<<"Incomplete data";
            return ;
        }
        if(n<1||n>100){
            cout<<"Incomplete data";
            return;
        }
        total=0;
        double value;
        for(int(i=0;i<n;i++){
            if(!(cin>>value)){
                cout<<"Incomplete data";
                return;
            }
            if(value<0){
                cout<<"Invalid Rainfall";
                return;
            }
            total=value;
        }
        cout<<fixed<<setprecision(2)<<total;
    }
};
int Rainfall::n=0;
double Rainfall::total=0.0;
int main(){
    Rainfall::valcalculate();
    return 0;
}