##def pong(receive: int) -> int:
##    potentialservice = receive - 1
##    for service in range(potentialservice, 0, -1):
##        print(service)
##        if not bool(receive % service):
##            return service


from math import sqrt

def pong(receive: int) -> int:
    potential_services = iter(range(receive - 1, 0, -1))
    service = next(potential_services)
    potential_service = not bool(receive % service)
    while True:
        service = next(potential_services)
        potential_service = not bool(receive % service)
        if potential_service:
            break
    return service


bounce = 1
def ping(ball: int, bounce: int) -> int:
    while ball > 1:
        bounce += 1
        ball = pong(ball)
    return bounce


ball = int(input())
print(ping(ball, bounce))