#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  vector<long long> v;
  long long last;
  int q, a, b, lo, hi, one, two;
  long double aa, bb;
  cin >> q;
  cout << fixed;
  cout << setprecision(6);
  while (q--) {
    cin >> a;
    if (a == 1) {
      cin >> b;
      if (v.size() == 0) {
        v.push_back(b);
      } else {
        v.push_back(b);
        v.back() += v[v.size() - 2];
      }
    } else {
      lo = 0;
      hi = v.size() - 2;
      if (hi < 0) {
        cout << (long double)0 << '\n';
        continue;
      }
      last = v.back() - v[v.size() - 2];
      while (lo < hi) {
        one = ((hi - lo) / 3) + lo;
        two = hi - ((hi - lo) / 3);
        aa = (long double)(v[one] + last) / (long double)(one + 2);
        bb = (long double)(v[two] + last) / (long double)(two + 2);
        if (aa < bb) {
          hi = two - 1;
        } else {
          lo = one + 1;
        }
      }
      aa = (long double)(v[lo] + last) / (long double)(lo + 2);
      aa = (long double)last - aa;
      cout << aa << '\n';
    }
  }
  return 0;
}
