#include<map>
#include<cstdio>
using namespace std;
FILE *f,*g;
int n,i,o,x,nr;
map<int,int>v;
int main()
{
    f=fopen("hashuri.in","r");
    g=fopen("hashuri.out","w");
    fscanf(f,"%d",&n);
    for(i=1;i<=n;++i)
    {
        fscanf(f,"%d%d",&o,&x);
        if(o==1)
        {
            if(!v.count(x))
            ++nr,v[x]=nr;
        }
        else
        if(o==2)
        v.erase(x);
        else
        if(v.count(x))
        fprintf(g,"0\n");
        else
        fprintf(g,"1\n");
    }
    return 0;
}