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#include <iostream>
#include <set>
#include <vector>
#include <fstream>
using namespace std;
ifstream fin("heapuri.in");
ofstream fout("heapuri.out");
set<int> v;
vector<int> poz;
int n,t,x,k;
int main()
{
fin>>n;
for(int i=1;i<=n;i++){
fin>>t;
if(t==1){
fin>>x;
poz.push_back(x);
v.insert(x);
}
else if(t==2){
fin>>x;
v.erase(poz[x-1]);
}
else if(t==3){
fout<<*v.begin()<<'\n';
}
}
return 0;
}