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#include <fstream>
#include <set>
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
set <int> s;
set <int>::iterator it;
int q,i,n,x,k,v[200010];
int main()
{
fin >>n;
for (i=1;i<=n;i++)
{
fin >> q;
if (q==1)
{
fin >>x;
s.insert(x);
v[++k]=x;
}
if (q==2)
{
fin >>x;
s.erase(v[x]);
}
if (q==3)
{
it=s.begin();
fout<<*it<<'\n';
}
}
return 0;
}