#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    int n,m;
    double weight,total=0.0;
    cin>>m;
    if(m>10)
    {
        cout<<<"Too many bags"<<endl;
        return 0;
    }
    for(int i=0;i<m;i++){
        cin>>weight;
        if(weight<0){
            cout<<"Inavlid weight"<<endl;
            return 0;
        }
        total+=weight
    }
}
cout<<fixed<<setprecision(2)<<total<<endl;
return 0;
}