def factorization(N):#素因数分解√N
    arr = []
    temp = N
    for i in range(2, int(-(-N**0.5//1))+1):
        if temp%i==0:
            cnt=0
            while temp%i==0:
                cnt+=1
                temp //= i
            arr.append([i, cnt])
    if temp!=1:
        arr.append([temp, 1])
    if arr==[]:
        arr.append([N, 1])
    return arr #[素因数、個数]
N = int(input())

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

ar = factorization(N)

ans = 0

for a,b in ar:
    ans += a * b

print(ans)