#include <iostream>
#include <fstream>
#include <set>
#define dMAX 200000

using namespace std;

int n, o, x, poz[dMAX + 2], idx;
set<int> myHeap;

ifstream fin("heapuri.in");
ofstream fout("heapuri.out");

int main()
{
    int i, j;
    fin >> n;
    for (i = 1; i <= n; i++) {
        fin >> o;
        switch (o) {
        case 1:
            fin >> x;
            myHeap.insert(x);
            poz[++idx] = x;
            break;
        case 2:
            fin >> x;
            myHeap.erase(poz[x]);
            break;
        case 3:
            fout << *myHeap.begin() << '\n';
            break;
        }
    }
    return 0;
}