#include<cstdio>
#include<map>
using namespace std;
int N,NR;
map<int,int>M;
int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    int i,tip,x;
    scanf("%d ",&N);
    for(i=1;i<=N;i++)
    {
        scanf("%d %d ",&tip,&x);
        if(tip==1&&M.find(x)==M.end())
          M[x]=++NR;
        if(tip==2)
          M.erase(x);
        if(tip==3)
          printf("%d\n",M.find(x)!=M.end());
    }
    return 0;
}