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