N = int(input())
if N % 2 == 0:
    N /= 2

n = 2
l = 1
s = 1
p = 1
import math
m = math.floor(math.sqrt(N))

while n in range(2, m):
    while N % n == 0:
        s += n**p
        p += 1
        N /= n
    else:
        l *= s
        s = 1
        p = 1
        n += 1

if N != 1:
    if l == 1:
        l = N+1
    else:
        l *= N+1

print(int(l))