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Competitions

# Between A and B

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

#### Input

Three numbers a, b and x (0ab1018, 1x1018).

#### Output

Print the answer to the problem.

Time limit 1 second
Memory limit 128 MiB
Input example #1
5 10 3

Output example #1
2