from collections import defaultdict
n=int(input())
m=int(n**0.5)+1
d=defaultdict(int)
for i in range(2,m):
  if n%i==0:
    while n%i==0:
      d[i]+=1
      n//=i
if n!=1:
  d[n]+=1
ans=0
for e in d:
  ans+=e*d[e]
print(ans)