#include <bits/stdc++.h>
#include <set>
using namespace std;
ifstream fin ("heapuri.in");
ofstream fout("heapuri.out");

set<int> h;

int n,x,v[200006],poz=0,y;
int main()
{
    fin>>n;
    for(int i=0;i<n;i++)
    {
        fin>>x;
        if(x==1)
        {
            fin>>y;
            h.insert(y);
            v[poz]=y;
            poz++;

        }
        else
        if(x==2)
        {
            fin>>y;
            h.erase(v[y]);

        }
        else
        if(x==3)
        {
           fout<<*h.begin()<<"\n";
        }
    }

    return 0;
}