#381. How many numbers in [a, b] are divisible by 7?
You get a and b (a ≤ b). How many numbers from a to b (both included) can be divided by 7?
### Input
One line: a b (1 ≤ a ≤ b ≤ 10000).
### Output
One integer.
Examples
Input
4960 9693
Output
676
Input
2722 5276
Output
365
💡 You can solve it with Python, JavaScript or blocks. Read the input line by line with input(). Don't print a question (like input("Number: ")). Print exactly what the output asks for, nothing more.