def prime_fact(N):
  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)