#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;
            }
            total weight += weight;
        }
    }
    cout<<fixed<<setprecision(2)<<totalweight;
    return 0;
}