#include <cstdio>
#include<vector>

#define MOD 666013

using namespace std;

vector <int> H[MOD];

int caut(int x)
{
    int h = x % MOD;
    for(size_t i=0;i<H[h].size();++i)
        if(H[h][i]==x)
            return i;
    return -1;
}

void adaug(int x)
{
    int h = x % MOD;
    if(caut(x)==-1)
        H[h].push_back(x);
}

void sterg(int x)
{
    int h = x % MOD;
    if(caut(x)>-1)
        H[h].erase(H[h].begin()+caut(x));
}

int main()
{
    freopen("hashuri.in","r",stdin);
    freopen("hashuri.out","w",stdout);

    int n;
    scanf("%d",&n);

    while(n--)
    {
        int op,x;
        scanf("%d %d",&op,&x);
        switch(op)
        {
            case 1:
                adaug(x);
                break;
            case 2:
                sterg(x);
                break;
            case 3:
                printf("%d\n",caut(x)>-1);
                break;
        }
    }

    return 0;
}