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#include<iostream>
#include<bits/stdc++.h>
#include <fstream>
#include<unordered_map>
#include <queue>
using namespace std;
int main(){
ifstream f ("in.txt");
ofstream f1("out.txt");
int n,k=0;
set<int> st;
f>>n;
int v[n];
for (int i=0;i<n;i++){
int ch,a;
f>>ch;
if (ch==1){
f>>a;
st.insert(a);
v[k]=a;
k++;
}
else if (ch==2){
f>>a;
st.erase(v[a-1]);
}
else if (ch==3){
f1<<*st.begin()<<endl;
cout<<*st.begin()<<"AA";
}
}
return 0;
}