Between A and B

Easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Given nonnegative integers $a$ and $b (a \leq b)$ and positive integer $x$ . How many numbers are there between $a$ and $b$ inclusively, divisible by $x$ ?

Input

Three numbers $a, b$ and $x (0 \leq a \leq b \leq 1 0^{18}, 1 \leq x \leq 1 0^{18})$ .

Output

Print the answer to the problem.

Examples

Input #1

Answer #1

Submissions 9K

Acceptance rate 21%