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#include <bits/stdc++.h>
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
const int NMAX = 200005;
int n,operatie,poz[NMAX],x,k;
set <int> s;
int main()
{
fin >> n;
for(int i=1;i<=n;i++){
fin >> operatie;
if(operatie==3){
fout << *s.begin() << '\n';
continue;
}
fin >> x;
if(operatie==1){
s.insert(x);
poz[++k]=x;
}
if(operatie==2) s.erase(poz[x]);
}
return 0;
}