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

const int N = 10001;
int w,n,m,cnt = 1;

int main()
{
    cin>>w>>n>>m;
    if(n>m)    swap(n,m);
    int nx = (n-1)/w+1,ny = (n-1)%w+1;
    int mx = (m-1)/w+1,my = (m-1)%w+1;
    if(nx%2==0)    ny = w-ny+1;
    if(mx%2==0)    my = w-my+1;
    // cout<<nx<<' '<<ny<<endl;
    // cout<<mx<<' '<<my<<endl;
    cout<<mx-nx+my-ny;

    return 0;
}