#include <iostream>
#include <fstream>
#include <set>
using namespace std;

int main()
{
    ifstream f("heapuri.in");
    ofstream g("heapuri.out");
    int n, a[200005], ord = 0;
    set <int> heap;
    int i, op, x;
    f>>n;
    for(i=0; i<n; i++)
    {
        f>>op;
        if(op == 1)
        {
            f>>x;
            heap.insert(x);
            a[++ord] = x;
        }
        else if(op == 2)
        {
            f>>x;
            heap.erase(a[x]);
        }
        else
            g<<*(heap.begin())<<"\n";
    }

    return 0;
}