from collections import Counter

def factorization(n) -> list:
	if n == 1:
		return Counter([0])
	ret = []
	i = 2
	while i * i <= n:
		while n % i == 0:
			n //= i
			ret.append(i)
		i += 1
	if n != 1:
		ret.append(n)
	return Counter(ret)

def main():
	n=int(input())
	ans=1
	for k,v in factorization(n).items():
		ans*=(k**(v+1)-1)//(k-1)
	print(ans)

if __name__=="__main__":
	main()