import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
pf={}
for i in range(2,int(n**0.5)+1):
  while n%i==0:
    pf[i]=pf.get(i,0)+1
    n//=i
if n>1:
  pf[n]=1
ans=1
for p in pf.keys():
  k=pf[p]
  ans*=(p**(k+1)-1)//(p-1)
print(ans)