Divisibility

A - Divisibility

Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u

Submit  Status

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

AC代码：

#include<stdio.h>
int main()
{
	__int64 k,a,b;
	while(scanf("%I64d%I64d%I64d",&k,&a,&b)!=EOF)
	{
		if(a>0&&b>0)
		printf("%I64d\n",b/k-(a-1)/k);
		if(a<=0&&b>=0)
		printf("%I64d\n",(b/k-a/k)+1);
		if(a<0&&b<0)
		printf("%I64d\n",(b+1)/k-a/k);
	}
	return 0;
}