#include <iostream>
#include <fstream>
#include <set>
#define DIM 200000
using namespace std;

int n,m,v[DIM];
set<int> num;

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