#include <iostream>
#include <iomanip>
using namespace std;
int main(){
    int n;
    cin>>n;
    double total = 0.0;
    for (int i=0; i<n ; j++){
        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 input";
                return 0;
            }
            total+=total;
        }
    }
    cout<<fixed<<setprecision(2)<<total;
    return 0;
}