#include <fstream>
#include <set>
#include <unordered_map>
using namespace std;
const int nmax = 2e5;

set < int > s;
unordered_map < int, int > mp;

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

int main() {
    int q, tip, a, elem = 0;

    fin >> q;

    while ( q-- ) {
        fin >> tip;
        if ( tip == 1 ) {
            fin >> a;
            s.insert ( a );
            mp[elem++] = a;
        } else if ( tip == 2 ) {
            fin >> a; a--;
            s.erase ( s.find ( mp[a] ) );
            mp.erase ( a );
        } else
            fout << *s.begin () << '\n';
    }

    return 0;
}