#include <bits/stdc++.h>
using namespace std;
int a,b,c; 
int x,y,e,f;
int main()
{
	cin>>a>>b>>c;
	x=1+b/a;
	y=b%a;
	if(x%2==0)
	{
		y=a-y+1;
	}
	e=1+c/a;
	f=c%a;
	if(e%2==0)
	{
		f=a-f+1;
	}
	cout<<abs(x-e)+abs(y-f);
	return 0;   
}

样例二输出和答案不一样，但是能A