#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
int w, m, n;
cin >> w >>m>> n;
m--,n-- ;
int x1= m%w,x2=n/ w;
int y1=m % w, y2 =n%w;
if(x1%2)    y1 = w -1- y1;
if（x2%2)   y2= w- 1 -y2;
cout <<abs(x1 -x2)+ abs(y1 - y2) <<endl;
return 0;
}