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

ifstream f("heapuri.in");
ofstream g("heapuri.out");
void solveA()
{
    set<int> myset;
    int t,pos[200003],x,op,i=0;
    f>>t;
    while(t--)
    {
        f>>op;
        switch(op)
        {
        case 1:
            i++;
            f>>x;
            myset.insert(x);
            pos[i] = x;
            break;
        case 2:
            f>>x;
            myset.erase(pos[x]);
            break;
        case 3:
                g<<*myset.begin()<<'\n';
            break;
        }
    }
}
int main()
{
    solveA();
    return 0;
}