#include<cstdio>
#include<map>
using namespace std;
int i,n,op,nr;
map<int,bool> M;
int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    scanf("%d",&n);
    for(;n;n--)
    {
        scanf("%d%d",&op,&nr);
        if(op==1) {M[nr]=1; continue;}
        if(op==2) {M.erase(nr); continue;}
        if(M[nr]) printf("1\n");
        else printf("0\n");
    }
    return 0;
}