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#include <iostream>
#include <fstream>
#include <set>
using namespace std;
ifstream f("heapuri.in");
ofstream g("heapuri.out");
set<int> heap;
int main()
{
int poz[200001],n,ct=0,x;
f>>n;
for(int i=0;i<n;i++)
{
char op;
f>>op;
if (op=='1')
{
f>>x;
poz[++ct]=x;
heap.insert(x);
}
else if(op=='2')
{
f>>x;
heap.erase(poz[x]);
}
else
{
g<<*heap.begin()<<'\n';
}
}
return 0;
}