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