#include <bits/stdc++.h>
#define in "heapuri.in"
#define out "heapuri.out"
using namespace std;
ifstream fin(in);
ofstream fout(out);

int n;
multiset <int> S;
map <int,int> M;

int main()
{
    int k = 0,i,op,x,val;
    multiset <int> :: iterator it;

    fin >> n;
    for (i = 1; i <= n; i++)
    {
        fin >> op;
        if (op == 1)
        {
            fin >> x;
            M[++k] = x;
            S.insert(x);
        }
        else if (op == 3) fout << *S.begin() << "\n";
        else
        {
            fin >> x;
            val = M[x];
            M.erase(x);

            it = S.find(val);
            S.erase(it);
        }
    }

    fin.close();
    fout.close();
    return 0;
}