def prime_fact(N):
    from collections import defaultdict
    res=defaultdict(int)
    for i in range(2,int(N**0.5)+2):
        if N%i==0:
            while N%i==0:
                res[i]+=1
                N//=i
    if N!=1:
        res[N]+=1
    return res

n = int(input())
d = prime_fact(n)
ans = 0
for x, y in d.items():
    ans += x * y
print(ans)