# 4658 质因数个数
n = int(input())

def deal(n):
    res = 0
    i = 2
    while(i * i <= n):
        if n % i == 0:
            res += 1
            while(n % i == 0):
                n = n // i
        i += 1
    if n > 1:
        res += 1
    return res

print(deal(n))