#include<fstream>
#include<set>
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
int a[200005],n,cod,x,nr;
set<int>s;
int main()
{
    fin>>n;
    for(int i=1;i<=n;i++)
    {
        fin>>cod;
        if(cod==1)
        {
            fin>>x;
            nr++;
            a[nr]=x;
            s.insert(x);
        }
        if(cod==2)
        {
            fin>>x;
            s.erase(s.find(a[x]));
        }
        if(cod==3)
            fout<<*s.begin()<<'\n';

    }

}