#include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
void GetPonit(int a,int b,int &x,int &y)
{
    x=b/a+1;
    if(b%a==0)x-=1;
    if(x % 2==0)
    {
        y=b%a;
        if(y==0)y=a;
    }
    else
    {
        if(b%a)y=a-b%a+1;
        else y=1;
    }
}
int main()
{
    int a,b,c,x1,y1,x2,y2;
    cin>>a>>b>>c;
    GetPonit(a,b,x1,y1);
    GetPonit(a,c,x2,y2);
    int ans=abs(x1-x2)+abs(y1-y2);
    cout<<ans<<endl;
    return 0;
}