#include<bits/stdc++.h>
using namespace std;

int main()
{
	int w,m,n;
	cin>>w>>m>>n;
	if(m>n)swap(m,n);
	int x=m;
	int a=(m-1)/w,b=(n-1)/w;
	int d=0,step=0;
	for(int r=a+1;r<=b;r++){
		if((r-1)&1==0 && r&1)d=2*w-(x%w)-1;
		else d=(w-x%w)*2+1;
		step++;
//		cout<<"d:"<<d<<endl;
//		cout<<"step:"<<step<<endl;
		x+=d;
//		cout<<"x:"<<x<<endl;
	}
	step+=abs(x-n);
	cout<<step<<endl;
	return 0;
}