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