Counting_multiples_of_3

# 8. Броене на кратни на 3 (for)
# Въведете две цели числа – начало и край.
# Използвайте for, за да преброите колко числа между тях (включително) се делят на 3.

num_start = int(input("Please enter integer: "))
num_end = int(input("Please enter integer: "))
counter = 0
flag = False

while True:
    if num_start < num_end:
        flag = True
        for i in range(num_start, num_end + 1):
            if i % 3 == 0:
                counter += 1
        break

    elif num_start == num_end:
        if num_start % 3 == 0:
            print("The numbers are equal and divisible by 3.")
        else:
            print("The numbers are equal and not divisible by 3.")
        break
    else:
        print("The first number cannot be greater than the second number")
        num_start = int(input("Please enter correct data: "))
        num_end = int(input("Please enter correct data: "))

if flag:
    print("Between numbers " + str(num_start) + " and " + str(num_end) + " тhere are " + str(counter) +
              " numbers that are divisible by 3.")