// editor3
#include <iostream>
#include <iomanip>
using namespace std;

int main(){
    int n;
    cin>>n;
    
    double totalWeight = 0.0;
    
    if(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;
    }
}