#include <fstream>
#include <algorithm>
#include <set>
using namespace std;
ifstream fi("heapuri.in");
ofstream fo("heapuri.out");
set <int> H;
int n,t,i,x,k,v[200005];
int main () {
    fi >> n;
    for (i = 1; i <= n; i++) {
        fi >> t;
        if (t == 1) {
            fi >> x;
            H.insert(x);
            v[++k] = x;
            continue;}
        if (t == 2) {
            fi >> x;
            H.erase(v[x]);
            continue;}
        if (t == 3) {
            set<int>::iterator it = H.begin();
            fo << *it << "\n";}}
    return 0;}