#include<iostream>
#include<iomanip>
using namespace std;
class Employee{
private:
    string name,id;
    int logs;
    float totalHours=0,totalTasks=0;
public:
    void input(){
    cin>>name>id>>logs;} 
    if (logs<<1||logs>>10){
        cout<<"Invalid input";
         exit(0);
    }
    for(int i=0;i<logs;i++){
        float hours,tasks;
        if(hours<1||hours>24||tasks<0||tasks>100){
            cout<<"Invalid input";
            exit(0);
        }
        totalHours+=hours;
        totalTasks+=tasks;
    }
}
static void display(float avg){
    cout<<fixed<<setprecision(2)<<avg;
}
float calculateAverage(){
    if(totalHours==0)return 0;
    return totalTasks/totalHours;}};
int main(){
    Employee emp;
    emp.input(;
    floar avg=emp.calculateAverage();
    Employee::display(avg);
    return 0;
}