import time primes = 0 n = int(input()) start = time.time() divisors = 0 for i in range(2, n): divisors = i-1 while i % divisors != 0: divisors = divisors - 1 if divisors == 1: primes = primes + 1 print(primes, time.time() - start) #def f(): # print(primes, n, start, divisors)