def sieve_of_eratosthenes(n):
    nums = list(range(2, n))
    while nums:
        prime = nums[0]
        nums = [i for i in nums if i % prime]
        yield prime

def main():
    num = 0
    another = True
    while another:
        try:
            num = int(input())
            another = False
        except ValueError:
            pass

    print()
    for i in sieve_of_eratosthenes(num):
        print(i)


if __name__ == "__main__":
    main()