#include <cstdio>
#include <map>

using namespace std;

map<int,int>v;
int k;
int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    int n,i,x,y;
    scanf("%d",&n);
    for(i=1;i<=n;i++){
        scanf("%d%d",&x,&y);
        if(x==1 and v.find(y)==v.end())
            v[y]=++k;
        if(x==2)
            v.erase(y);
        if(x==3){
            if(v.find(y)==v.end())
                printf("0\n");
            else
                printf("1\n");
        }
    }
    return 0;
}