#include <fstream>
#include <set>

using namespace std;

int main()
{
    ifstream fin("heapuri.in");
    ofstream fout("heapuri.out");
    set<int> heap;
    int n,op,nr,v[200005],nV=1;
    fin>>n;
    for(int i=1;i<=n;i++) {
        fin>>op;
        if(op==1) {
            fin>>nr;
            heap.insert(nr);
            v[nV]=nr,nV++;
        }
        else if(op==2) {
            fin>>nr;
            heap.erase(v[nr]);
        }
        else
            fout<<*heap.begin()<<'\n';
    }
    return 0;
}