#include <bits/stdc++.h>
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
set <int> s;
int n,x,y,chrno[10000001],k;
int main()
{
    fin>>n;
    for(int i=1; i<=n; ++i)
    {
        fin>>x;
        if(x==3) fout<<*s.begin()<<"\n";
        else
        {
            fin>>y;
            if(x==1)
            {
                s.insert(y);
                chrno[++k]=y;
            }
            if(x==2)
            {
                s.erase(chrno[y]);
            }
        }
    }
    return 0;
}