#include <set>
#include <vector>
#include <fstream>

using namespace std;

ifstream f("heapuri.in");
ofstream g("heapuri.out");

#define nrmax 200010
int N, x, op, idx, i, pos[nrmax];

set <int> heap;

int main() 
{
    f >> N;

    for (i = 0; i < N; ++i) 
    {
        f >> op;
        if (op == 1) 
        {
            f >> x;
            heap.insert(x);
            pos[++idx] = x;
        }
        else if (op == 2) 
        {
            f >> x;
            heap.erase(pos[x]);
        }
        else 
        {
            g << *heap.begin() << endl;
        }
    }

}