#include<iostream>
#include<iomanip>
using namespace std;
int main(){
    int n;
    if(!(cin>>n)){
        return 0;
    }
    double total=0.0;
    for(int i=0,i<n;i++){
        int m;
        cin>>m;
        if(m>10){
            cout<<"Too many bags"<<endl;
            return 0;
        }
    for(int j=0;j<m;j++){
        double weight;
        cin>>weight;
        if(weight<0){
            cout<"invalid weight"<<endl;
            return 0;
        }
        total weight +=weight;
    }
  }
  cout<<fixe3d<<setprecision(2)<<total<<endl;
  return 0;
}