#include<fstream>
#include<set>
#define nx 200007
using namespace std;
int n,i,t,x,m,k,v[nx];
set<int>a;

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

int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>t;
        if(t==3)
        {
            x=*a.begin();
            fout<<x<<'\n';
        }
        else
        {
            fin>>x;
            if(t==1)k++,v[k]=x,a.insert(x);
            else a.erase(v[x]);
        }
    }
    return 0;
}