#include <iostream>
#include <math.h>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <functional>
#define REP(i,n) for(int i=0;i<n;i++)
typedef long long ll;

using namespace std;
int kaijo(int n){
	int ans = 1;
	if (n != 0){
		for (int i = 0; i < n; i++){
			ans *= (n - i);
		}
	}
	else{
		ans = 1;
	}
	return ans;
}

int main(){
	int q;
	int c, x;
	int ans = 0;
	cin >> q;
	vector<ll> a;
	vector<ll> b;
	ll l[100000];
	REP(i, q){
		ans = 0;
		cin >> c >> x;
		if (c == 1){
			a.push_back(x);
		}
		else if (c == 2){
			a.erase(a.begin() + x - 1);
		}
		else{
			int j = 0;
			for (auto itr = a.begin(); itr != a.end();itr++){
				a[j] += x;
				j++;
			}
		}
		b = a;
		sort(b.begin(), b.end());
		for (auto itr = b.begin(); itr != b.end(); itr++){
			if (*itr <= distance(itr, b.end())){
				ans = *itr;
			}
			else{
				break;
			}
		}
		if (ans <= 0){
			
			ans = distance(lower_bound(b.begin(), b.end(), 0), b.end());
		}
		l[i] = ans;
	}
	REP(i, q){
		cout << l[i] << endl;
	}
	return 0;
}