#include <cstdio>
#include <set>

using namespace std;

#define FILEIN "heapuri.in"
#define FILEOUT "heapuri.out"
#define NMAX 200005

int A[NMAX], T, x, N, k = 0; set<int> Heap;

int main() {
    freopen(FILEIN, "r", stdin);
    freopen(FILEOUT, "w", stdout);

    for ( scanf("%d", &N); N; N-- ) {
        scanf("%d", &T);

        if (T == 3) {
            printf("%d\n", *Heap.begin());
            continue;
        }

        scanf("%d", &x);

        if (T == 1) {
            Heap.insert(x);
            A[++k] = x;
        }

        if (T == 2) {
            Heap.erase(A[x]);
        }
    }

    return 0;
}