def factorization(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
n=int(input())
ans=0
v=factorization(n)
if n==1:
    print(0)
    exit()
for i in v:
    ans+=(i[0]*i[1])

print(ans)