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