def divisors(x):
    d = 1
    res1 = []
    res2 = []
    while d * d < x:
        if x % d == 0:
            res1.append(d)
            res2.append(x // d)
        d += 1
    if d * d == x:
        res1.append(d)
    while res2:
        res1.append(res2.pop())
    return res1

n = int(input())
print(n - len(divisors(n)))