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