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#include <fstream>
#include <set>
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
set <int> li;
set <int>::iterator it;
int n,i,v[200001],act,tip,x;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
{
fin>>tip;
if(tip!=3)
fin>>x;
if(tip==1)
{
act++;
li.insert(x);
v[act]=x;
}
if(tip==2)
{
it=li.find(v[x]);
li.erase(it);
}
if(tip==3)
{
it=li.begin();
fout<<* it<<'\n';
}
}
return 0;
}