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