#include <cstdio>
#include <set>
#define MOD 1333
using namespace std;
set<int>s[MOD];
int m;

int main(){
    int c,x;
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);
        scanf("%d",&m);
        for(int i=1;i<=m;i++){
            scanf("%d %d",&c,&x);
            switch(c){
                case 1: s[x%MOD].insert(x); break;
                case 2: s[x%MOD].erase(x); break;
                case 3: printf("%d\n",s[x%MOD].find(x)!=s[x%MOD].end());  }
        }
}