#include<iostream>
using namespace std;
class workout{
    public:
    void display(int arr[],int n){
        double cal=0;
        double min=0;
        for(int i=0;i<(n*2);i++){
            if(i%2==0){
                min+=arr[i];
            }else{
                cal+=arr[i];
            }
            
             cout<<fixed<<setprecision(2)<<cal/min<<endl;
        }
    }
    };
    int main(){
        string type;
        string id;
        string goal;
        int n;
        cin>>type>>id>>goal>>n;
        int arr[n*2];
        for(int i=0;i<(n*2);i++){
            cin>>arr[i];
            if(arr[i]<=0){
                cout<<"Invalid input";
                return 0;
            }
        }
        workout obj;
        obj.display(arr,n);
        return 0;
    }
    }
}