#include<iostream>
using namespace std ;
int main(){
    string name ;
    getline(cin,name) ;
    
    int n;
    cin>>n;
    int h,t;
    float sh,st,
    for(int i= 0;i<n;i++){
        cin>>h[i]>>t[i];
        sh+=h[i];
        st+=t[i];
        cout<<fixed<<steprecision(2)<<st/sh;
    }
}