#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;
            }
            
            totalrainfall+=rainfall;
        }
        cout<<fixed<<setprecision(2)<<totalrainfall<<enadl;
    }
};
double rainfallcalculator::totalrainfall=0;
int main()
{
    int n;
    if(!(cin>>n))
    {
        cout<<"IncompleteData"<<endl;
        return 0;
    }
    rainfallcalculator::calculate(n);
    return 0;
    
}