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