#include <iostream>
#include <cmath>
using namespace std;

int res;
int w,m,n;
int c1,c2;
int r1,r2;


int main(){

    cin>>w>>m>>n;

    if(m % w == 0)
        r1 =  m / w ;
    else
        r1 = m / w + 1;
    if(n % w == 0)
        r2 =  n / w ;
    else
        r2 = n / w + 1;


    if(r1 % 2 == 0)
        c1 = w - (m - (r1-1) * w) + 1;
    else 
        c1 = m - (r1-1) * w;

    if(r2 % 2 == 0)
        c2 = w - (n - (r2-1) * w) + 1 ;
    else 
        c2 = n - (r2-1) * w;  
    cout<<abs(r1 - r2) + abs(c1 - c2)<<endl;
    return 0;
}