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