n = int(input())
yakusuu = []
seki = 1
wa = 0
for i in range(1, 101):
    if n % i == 0:
        yakusuu.append(i)
        seki *= i
        wa += i
ans = wa * seki
waru = 0
for i in yakusuu:
    waru += seki // i
print(ans // waru)