#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("heapuri.in");
ofstream fout("heapuri.out");

void p1(int n,int a[]){
    int x,ok=0;
    fin>>x;
    for(int i=1;i<n && ok==0;i++){
            if(a[i]==-1){a[i]=x;ok=1;}
    }
}

void p2(int n,int a[]){
    int x;
    fin>>x;
    for(int i=0;i<=x;i++){
        if(i==x) a[i]=-1;
    }
}

void p3(int n,int a[]){
    int db=0,min=200000;
    for(int i=0;i<n;i++){
            if(a[i]<min && a[i]!=-1) {min=a[i];db++;}
    }
    if(db!=0) fout<<min<<endl;
}

int main()
{
    int n,p;
    fin>>n;
    int a[200000];
    for(int i=0;i<n;i++){
        a[i]=-1;
    }
    while(fin>>p){
    if(p==1) p1(n,a);
    else if(p==2) p2(n,a);
    else p3(n,a);
    }
    return 0;
}