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A. Divisibility

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputFind the number of *k*-divisible numbers on the segment [*a*, *b*]. In other words you need to find the number of such integer values *x* that *a* ≤ *x* ≤ *b* and *x* is divisible by *k*.

Input

The only line contains three space-separated integers *k*, *a* and *b* (1 ≤ *k* ≤ 10^{18}; - 10^{18} ≤ *a* ≤ *b* ≤ 10^{18}).

Output

Print the required number.

Examples

Input

1 1 10

Output

10

Input

2 -4 4

Output

5

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

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