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