import sys


def is_prime(n):
    if n == 1:
        return False
    for i in range (2,n):
        if n % i == 0:
            return False
    return True

def find_primes(n):
    primes = []
    for i in range(1, n+1):
        if is_prime(i):
            primes.append(str(i))
    return ", ".join(primes)


n = int(sys.argv[1])
print(f"Prime numbers: {find_primes(n)}")