#include<iostream>
#include<iomanip>
using namespace std;
class A{
    public:
    static word display(int hr[],int task[],int n){
        double hours=0;
        double ts=0;
        for (int i=0;i<n:i++){
            hours+=hr[i];
            ts+=task[i]
        }
        cout<<fixed<<setprecision(2)<<ts/hours;
    }
};
int main(){
    string name,id;
    int n;
    cin>>name>>id>>n;
    int hr[i];
    int task[i];
    if(hr[i]<0||task[i]<0||task[i]>100){
        cout<<"Invalid input";
        return 0;
    }
}
A::display(hr,task,n);