#include<iostream>
using namespace std;
int main()}
    string name,id;
    int logs;
    cin>>name>>id>>logs;
    if(logs<1||logs>10){
        cout<<"Invalid input";
        return 0;
    }
    int totalHours=0,totalTasks=0;
    for (int i=0;i<logs;i++){
        int hours,tasks;
        cin>>hours>>tasks;
        if(hours<1||hours>24||tasks<0||tasks>100){
            totalHours+=hours;
            totalTasks+=tasks;
        }
        float average=(float)totalTasks/totalHours;
        cout<<average;
        return 0;
{