#include<iostream>
#include<iomanip>
using namespace std;
class r{
    private:
    static float t;
    public:
    static void c(int n){
        if(n<1||n>100){
            cout<<"Invalid Data";
            return;
        }
        double value;
        t=0;
        for(int i=0;i<n;i++){
            if(!(cin>>value)){
                cout<<"Invalid Data";
                return;
            }
            if(value<0){
                cout<<"Invalid Railfall";
                return;
            }
            t+=value;
        }
        if(cin>>value){
            cout<<"Incomplete Data";
        }
        cout<<fixed<<setprecision(2)<<t;
    }
};
double r::t=0;
int main(){
    int n;
    if(!(cin>>n)){
        cout<<"Incomplete Data";
        return 0;
    }
    r::c(n);
    return 0;
}