#include <bits/stdc++.h>
using namespace std;
double res;
long long n, m, k, i, j, x = 1, y, t, a[1000001], b[1000001];
int main() {
  cin >> n;
  for (i = 1; i <= n; i++) {
    cin >> t;
    if (t == 1) {
      cin >> k >> m;
      a[k] += m;
      y += k * m;
      printf("%.10f", (double)y / x);
      cout << endl;
    }
    if (t == 2) {
      cin >> k;
      y += k;
      x++;
      b[x] = k;
      printf("%.10f", (double)y / x);
      cout << endl;
    }
    if (t == 3) {
      a[x - 1] += a[x];
      y -= a[x] + b[x];
      a[x] = 0;
      x--;
      printf("%.10f", (double)y / x);
      cout << endl;
    }
  }
}
