N = int(input())
if N == 1:
    print(0)
    exit()


def factorization(n):
    if n == 1:
        return [[1, 1]]
    temp = n
    ans = []
    for i in range(2, int(n**0.5+1.01)):
        if temp % i == 0:
            ct = 0
            while temp % i == 0:
                temp //= i
                ct += 1
            ans.append([i, ct])
    if temp != 1:
        ans.append([temp, 1])
    return ans


d = factorization(N)
ans = 0
for p, c in d:
    ans += p*c
print(ans)