#include <bits/stdc++.h>

using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
vector <int> v;
set <int> s;

int main()
{
    int n,c,x;
    fin >> n;
    v.push_back(0);
    while(n--){
        fin >> c;
        if(c == 1){
            fin >> x;
            v.push_back(x);
            s.insert(x);
        }
        else if(c == 2){
            fin >> x;
            s.erase(v[x]);
        }
        else fout << *s.begin() << "\n";
    }
    return 0;
}