题解 | 1=N
1=N
https://www.nowcoder.com/practice/31469f8503c24914acd5c0290ad4dfbb
n = int(input())
a = []
i = 2
while i * i <= n:
while n % i == 0:
a.append(i)
n //= i
i += 1
if n > 1:
a.append(n)
s = 0
for i in a:
s += i
print(s)
