# verification-helper: PROBLEM https://yukicoder.me/problems/no/1737

import sys
sys.path.append("../../")

def factorization(n: int) -> int:
    arr, tmp = [], n
    for i in range(2, int(-(-n ** 0.5 // 1)) + 1):
        if tmp % i == 0:
            cnt = 0
            while tmp % i == 0:
                cnt += 1
                tmp //= i
            arr.append([i, cnt])

    if tmp != 1:
        arr.append([tmp, 1])

    return arr

n = int(input())

if n == 1:
    exit(print(0))

fac = factorization(n)

ans = 0
for i, j in fac:
    ans += i * j

print(ans)