#include<iostream>
#include<iomaip>
using namespace std;
class ra
{
    public:
    static double t;
    static void cal()
    {
        int n;
        if(!(cin>>n))
        {
            cout<<"Incompelete Data";
            return ;
        }
        double value;
        for(int i=0;i<n;i++)
        {
            if(!(cin>>value))
            {
                cout<<"Incompelete Data";
                return ; 
            }
            if (value<0)
            {
                 cout<<"Invalid Rainfail";
                 return ;
            t+=value;
        }
        cout<<fixed<<setprcision(2)<<t;
    }
    
};
double ra::t=0;
int main(){
    ra::cal();
    return 0;
}