with open("hashuri.in", "r") as infile:
    with open("hashuri.out", "w") as outfile:
        queries = infile.read().split('\n')
        n = int(queries[0])
        queries = queries[1:]
        s = set([])
        for i in range(n):
            e = queries[i]
            q, x = [int(x) for x in e.split(' ')]
        
            if q == 1:
                s.add(x)
            if q == 2:
                if x in s:
                    s.remove(x)
            if q == 3:
                if x in s:
                    outfile.write("1\n")
                else:
                    outfile.write("0\n")