Competitions

# Week 8: December 28 - January 10. Functions. Part 2

# Between A and B

Given nonnegative integers **a** and **b** (**a** ≤ **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** ≤ **a** ≤ **b** ≤ `10`

, ^{18}**1** ≤ **x** ≤ `10`

).^{18}

#### Output

Print the answer to the problem.

Input example #1

5 10 3

Output example #1

2