#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a, b;
  while (cin >> n) {
    stack<int> st;
    bool ov = true;
    int ovs = 0;
    int res = 0;
    int spd = 0;
    for (int i = 0; i < n; i++) {
      scanf("%d", &(a));
      if (a == 1) {
        scanf("%d", &(b));
        spd = b;
      } else if (a == 2) {
        res += ovs;
        ovs = 0;
      } else if (a == 3) {
        scanf("%d", &(b));
        st.push(b);
      } else if (a == 4) {
        ovs = 0;
      } else if (a == 5) {
        while (!st.empty()) st.pop();
      } else if (a == 6) {
        ovs++;
      }
      while (!st.empty() && st.top() < spd) {
        st.pop();
        res++;
      }
    }
    cout << res << endl;
  }
  return 0;
}
