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#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
set<int> H;
set<int>::iterator it;
int ord[200001],ct,i,n,k=0,x;
int main()
{
f>>n;
for(i=1;i<=n;i++)
{f>>ct;
if(ct==1)
{f>>x;
H.insert(x);
ord[++k]=x;}
else
if(ct==2)
{f>>x;
H.erase(ord[x]);}
else
g<<*H.begin()<<'\n';}
f.close();
g.close();
}