#include<bits/stdc++.h>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
int n;
int pz[200002], cc;
set<int>s;
int main()
{
    f >> n;
    for(int i = 1; i <= n; ++i)
    {
        int a;
        f >> a;
        if(a == 3)
            g << *s.begin() << '\n';
        else
        {
            int x;
            f >> x;
            if(a == 1)
                s.insert(x), pz[++cc] = x;
            else
                s.erase(pz[x]);
        }
    }
    return 0;
}