#include<bits/stdc++.h>
using namespace std;
int main()
{
int w, m, n, my, ny;
cin >> w >> m >> n;
int mx = m / w + 1;
int nx = n / w + 1;
if(m % w == 0)
mx--;
if(n % w == 0)
nx--;
if(mx % 2 != 0)
{
my = m % w;
}
else
{
my = w - m % w + 1;
}
if(nx % 2 != 0)
{
ny = n % w;
}
else
{
ny = w - n % w + 1;
}
cout << abs(mx - nx) + abs(my - ny) << endl;
return 0;
}