def main():
    store = set()

    with open('hashuri.in') as fin, open('hashuri.out', 'w') as fout:
        fin.readline()
        for query in fin:
            qtype, elem = list(map(int, query.split()))
            if qtype == 1:
                store.add(elem)
            if qtype == 2:
                store.discard(elem)
            if qtype == 3:
                print('1' if elem in store else '0', file=fout)

if __name__ == '__main__':
    main()