import sys
input = sys.stdin.readline

N=int(input())

x=N
import math 
L=int(math.sqrt(x))

FACT=dict()

for i in range(2,L+2):
    while x%i==0:
        FACT[i]=FACT.get(i,0)+1
        x=x//i

if x!=1:
    FACT[x]=FACT.get(x,0)+1

ANS=0
for f in FACT:
    ANS+=f*FACT[f]

print(ANS)