#include<cstdio>
#include<cctype>
#include<set>
#define HEAP_SIZE 200000
#define BUF_SIZE 1 << 18
using namespace std;

set<int> h;
char buf[BUF_SIZE];
int v[HEAP_SIZE + 1], k, pos = BUF_SIZE;

inline char getChar(FILE* fin) {
    if(pos == BUF_SIZE) {
        fread(buf, 1, BUF_SIZE, fin);
        pos = 0;
    }
    return buf[pos++];
}

inline int read(FILE* fin) {
    int res = 0;
    char ch;
    do {
        ch = getChar(fin);
    }while(!isdigit(ch));
    do {
        res = 10*res + ch - '0';
        ch = getChar(fin);
    }while(isdigit(ch));
    return res;
}

int main() {
    FILE* fin, *fout;
    fin = fopen("heapuri.in", "r");
    fout = fopen("heapuri.out", "w");
    int op, x, n;
    fscanf(fin,"%d", &n);
    for(int i = 0; i < n; ++i) {
        fscanf(fin,"%d", &op);
        if(op < 3)
            fscanf(fin,"%d", &x);
        if(op == 1) {
            v[++k] = x;
            h.insert(x);
        } else if(op == 2) {
            h.erase(v[x]);
        } else fprintf(fout,"%d\n", *h.begin());
    }
    fclose(fin);
    fclose(fout);
    return 0;
}