#include <bits/stdc++.h>
using namespace std;
int n,i,op,x,cnt;
unordered_set<int>Set;
int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        scanf("%d %d",&op,&x);
        if(op==1)
            Set.insert(x);
        if(op==2)
            Set.erase(x);
        if(op==3)
            if(Set.count(x)>0)
                printf("1\n");
            else printf("0\n");
    }
    return 0;
}