with open("hashuri.in", "r") as fin:
    n = int(fin.readline())
    dct = {}
    with open("hashuri.out", "w") as fout:
        for i in range(n):
            op, x = list(map(int, fin.readline().split(" ")))
            if op == 1:
                dct[x] = 1
            elif op == 2:
                try:
                    dct.pop(x)
                except KeyError:
                    continue
            else:
                try:
                    if dct[x] == 1:
                        fout.write("1\n")
                except KeyError:
                    fout.write("0\n")