#include <bits/stdc++.h>

using namespace std;


map <int,int> m;
int main()
{
    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);
    int n,x,y;
    scanf("%d ", &n);
    for(int i=1;i<=n;i++){
        scanf("%d%d ", &x,&y);
        switch(x){
        case 1:
            m[y]=1;
            break;
        case 2:
            m[y]=0;
            break;
        case 3:
            if(m[y]==1)
                 printf("%d\n",1);
            else
                 printf("%d\n",0);
            break;
        }
    }
    return 0;
}