#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 bags";
            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;
}