#include <cmath>
#include <iomanip>
#include <iostream>
#include <vector>
class Fenwick3D {
 public:
  Fenwick3D(int n) {
    // tree_.assign(n, 0);   // tree_
    arr_.assign(n, 0);    // how many guys are there for that time
    pages_.assign(n, 0);  // track of time of each user
  }
  /*int GetSum(int right) const {
    int value = PrefixSum(right);
    return value;
  }*/
  double UserCount(int index) const {
    if (index > static_cast<int>(pages_.size())) {
      return 0;
    }
    if (pages_[index] == 0) {
      return 0;
    }
    const int kIndex = static_cast<int>(arr_.size());
    // double all_users = static_cast<double>(GetSum(kIndex - 1));
    if (all_users_ == 0) {
      return 0;
    }
    if (all_users_ == 1) {
      return 1;
    }
    double users = static_cast<double>(PrefSum(index));
    // double all_users = static_cast<double>(PrefSum(kIndex - 1));
    users /= (all_users_ - 1);
    return users;
  }
  void Update(int user, int new_time) {
    if (user > static_cast<int>(pages_.size())) {
      pages_.resize(user + 1, 0);
    }
    int old_time = pages_[user];
    if (old_time != 0) {
      UpdateUsers(old_time, -1);
    }
    if (old_time == 0) {
      all_users_++;
    }
    // int delta = value - old_time;
    // UpdateDelta(user, delta);
    UpdateUsers(new_time, 1);
    pages_[user] = new_time;
  }

 private:
  static int F(int i) { return (i & (i + 1)); }
  static int G(int i) { return (i | (i + 1)); }
  int PrefSum(int right) const { return PrefCount(pages_[right] - 1); }
  int PrefCount(int value) const {
    int answer = 0;
    for (int x = value; x >= 0; x = F(x) - 1) {
      answer += arr_[x];
    }
    return answer;
  }
  void UpdateUsers(int user, int delta) {
    if (user > static_cast<int>(arr_.size())) {
      arr_.resize(user * 2, 0);
    }
    const int kSize = static_cast<int>(arr_.size());
    for (int x = user; x < kSize; x = G(x)) {
      arr_[x] += delta;
    }
  }
  // std::vector<int> tree_;
  std::vector<int> arr_;
  std::vector<int> pages_;
  double all_users_;
};

void Requests() {
  int n = 0;
  std::cin >> n;
  Fenwick3D fenwick(n);
  std::string req;
  int r = 0;
  int l = 0;
  for (int k = 0; k < n; ++k) {
    std::cin >> req;
    if (req == "RUN") {
      std::cin >> l >> r;
      fenwick.Update(l - 1, r);
    } else if (req == "CHEER") {
      std::cin >> l;
      double sum = fenwick.UserCount(l - 1);
      std::cout << std::fixed << std::setprecision(6) << sum << "\n";
    }
  }
}
int main() {
  Requests();
  return 0;
}