// editor3
#include<iostream>
#include<iomanip>
using namespace std;
class Baggage{
    public:
    static void calculate(int n){
        int m;
        double w,total = 0;
        for(int i=0;i<n;i++){
            cin>>m;
            if(m>10){
                cout<<"Too many bags";
                return;
            }
            for(intj=0;j<m;j++){
                cin>>w;
                if(w<0){
                    cout<<"Invalid weight";
                    return;
                }
                total+=w;
            }
        }
        cout<<fixed<<setprecision(2)<<total;
    }
};
int main(){
    int n;
    cin>>n;
    Baggage::calculate(n);
    return 0;
}