#include<iostream>
#include<vector>
#include<iomanip>
using namespace std;
int main(){
    int n;
    if(!(cin>>n)) return 0;
    double totalWeight = 0;
    for(int i=0;i<n;i++){
        int m;
        cin>>m;{
            cout<<"Too many bags"<<endl;
            return 0;
        }
        for(int j=0;j<m;j++){
            double w;
            cin>>w;
            if(w<0){
                cout<<"Inavlid Weight"<<endl;
                return 0;
            }
            totalWeight+=w;
        }
    }
    cout<<fixed<<setprecision(2)<<totalWeight<,endl;
    return 0;
}