def Prime_Factorization(N):
    if N<0:
        R=[[-1,1]]
    else:
        R=[]

    N=abs(N)

    if N&1==0:
        C=0
        while N&1==0:
            N>>=1
            C+=1
        R.append([2,C])

    if N%3==0:
        C=0
        while N%3==0:
            N//=3
            C+=1
        R.append([3,C])

    k=5
    Flag=0
    while k*k<=N:
        if N%k==0:
            C=0
            while N%k==0:
                C+=1
                N//=k
            R.append([k,C])
        k+=2+2*Flag
        Flag^=1

    if N!=1:
        R.append([N,1])

    return R
#==================================================
N=int(input())

X=0
for p,e in Prime_Factorization(N):
    X+=p*e

print(X)