#include<iostream>

 #include<cstring>

 #include<string>

 #include<queue>

 #include<vector>

 #include<algorithm>

 #include<cmath>

 #include<iomanip>

 #include<cstdio>

 #define LL long long

 #define ULL unsigned LL

 #define lson l,m,rt<<1

 #define rson m+1,r,rt<<1|1

 #define fi first

 #define se second

 using namespace std;

 const int N = 5e5+;

 LL a[N];

 int main(){

     int Q;

     scanf("%d",&Q);

     int t;

     LL sum = ;

     int cnt = , tot = ;

     while(Q--){

         scanf("%d",&t);

         if(t == ){

             printf("%.7f\n",a[tot]-1.0*(a[tot]+sum)/cnt);

         }

         else {

             scanf("%I64d", &a[++tot]);

             while(cnt < tot){

                 if(a[cnt]*cnt < sum+a[tot])

                     sum += a[cnt++];

                 else break;

             }

         }

     }

     return ;

 }