#include <bits/stdc++.h>

using namespace std;

map <int, bool> mp;

int main() {
    int i,op,nr,n;
    freopen("hashuri.in","r", stdin);
    freopen("hashuri.out","w", stdout);
    scanf("%d",&n);
    for(i = 1;i <= n;i++){
        scanf("%d %d",&op,&nr);
        if(op == 1){
            mp[nr] = 1;
        }else if(op == 2){
            mp[nr] = 0;
        }else{
            if(mp[nr] == 1){
                printf("1\n");
            }else{
                printf("0\n");
            }
        }
    }
    return 0;
}