#include<bits/stdc++.h>
using namespace std;
ifstream F("heapuri.in");
ofstream G("heapuri.out");
set<int> h;
int n,k,x,p,v[200005];
int main()
{
    for(F>>n;n--;) {
        F>>x;
        if(x==1)
            F>>k,v[++p]=k,h.insert(k);
        else if(x==3)
            G<<*h.begin()<<'\n';
        else
            F>>k,h.erase(v[k]);
    }
    return 0;
}