#include <iostream>
#include <iomanip>
using namespace std;
class rainfallcalculator {
     private:
     static double totalrainfall;
     public:
     static void calculate(int n){
         double rainfall;
         totalrainfall = 0;
         for (int i = 0 ; i < n ; i++){
             if (!(cin >> rainfall)){
                 cout<<"Incomplete Data"<<endl;
                 return;
             }
             if (rainfall< 0){
                 cout<<"Invalid Rainfall"<<endl;
                 return;
             }
             totalrainfall += rainfall;
         }
         cout<<fixed<<setprecision(2)<<totalrainfall<<endl;
         
     }
};
douyble rainfallcalculator::totalrainfall= 0;
int main(){
    int n;
    if(!(cin>>n)){
        cout<<"Incomplete Data"<<endl;
        return 0;
    }
    rainfallcalculator::calculate(n);
    return 0;
}