def is_prime(num):

    if num <= 1:
        return False
    for i in range(2, int(num ** 0.5) + 1):
        if num % i == 0:
            return False
    return True


prime_numbers = []
for num in range(500, 600):
    if is_prime(num):
        prime_numbers.append(num)


print("Prime numbers with three digits starting with 5:", prime_numbers)