#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 Date";
            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 RainfallCalculator::n=0;
double RainfallClculator::total=0.0;
int main(){
    RainfallCalculator::calculate();
    return 0;
}