Divisibility
说明
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≤1018;-1018≤a≤b≤1018).
Output
Print the required number.
Examples
Input
1 1 10
Output
10
Input
2 -4 4
Output
5
样例
