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def is_zero_div(a, m):
    return any((a*b)%m == 0 for b in range(1, m))

def zero_divisors(m):
    return [a for a in range(m) if is_zero_div(a, m)]

print(len(zero_divisors(60)))

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def Vmod(m):
    return lambda a: {x for x in range(a, m + 1) if x%a == 0}

V = Vmod(60)
print("{} + {} + {} - ({} + {} + {}) + {} = {}".format(
    len(V(2)), len(V(3)), len(V(5)),
    len(V(2) & V(3)), len(V(2) & V(5)), len(V(3) & V(5)),
    len(V(2) & V(3) & V(5)),
    len(V(2) | V(3) | V(5))
))