#include <fstream>
#include <cstdio>
#include <map>

using namespace std;

int N, i, op, x;
map<int, int> dp;

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)
          dp[x]=1;
        if (op==2)
          dp[x]=0;
        if (op==3)
          printf("%d\n", dp[x]);
    }
    return 0;
}