#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
class User{
    protected:
    string usertype;
    string userID;
    public:
    void getuserinfo(){
        cin>>usertype>>userID;}};
class Workout: protected User{
    protected:
    string goal;
    int logs;
    double totalcalories=0;
    double totalduration=0;
    public:
    void inputUser(){
        getuserinfo();}
    void getworkoutData(){
        cin>>goal>>logs;
        for(int i=0;i<logs;i++){
            double duration, calories;
            if(duration<=0||calories<=0){
                cout<<"Invalid input";
                exit(0);}
            totalduration +=duration;
            totalcalories +=calories;}}
    void calculateAverage(){
        double avg=totalcalories/totalduration;
        cout<<fixed<setprecision(2)<<avg}};
int main(){
    Workout w;
    w.inputUser();
    w.getworkoutData();
    w.calculateAverage();
    return 0;}
}