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#include <fstream>
#include <set>
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
set<int>v;
int poz[200005];
int n,op,x,m,i;
int main()
{
fin>>n;
for(i=1;i<=n;i++)
{fin>>op;
if(op==1)
{fin>>x;
m++;
poz[m]=x;
v.insert(x);}
if(op==2)
{fin>>x;
v.erase(poz[x]);}
if(op==3)fout<<*v.begin()<<'\n';
}
return 0;
}