#include<iostream>
#include<iomanip>
using namespace std;
class rainfall{
    public:
    static void calculate(int n){
        float x,sum = 0;
        for(int i=0;i<n;i++){
            if (!(cin>>x)){
                cout<<"Incomplete Date";
                return;
            }
            if(x<0){
                cout<<"Invalid Rainfall";
                return;
            }
            sum+=x;
        }
        cout<<fixed<<setprecision(2)<<sum;
    }
};
int main(){
    int n;
    if(!(cin>>n)){
        cout<<"Incomplete data";
        return 0;
    }
    Rainfall::calculate(n);
    return 0;
}