Divisibility

Time Limit: 1 second

Memory Limit: 256 megabytes

Description

Find 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 ≤ 1018; - 1018 ≤ a ≤ b ≤ 1018).

Output

Print the required number.

Sample Input

Input
1 1 10
Output
10
Input
2 -4 4
Output
5

Sample Output

None

Hint

None

Source

None

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