#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
using namespace std;
int n,s,t;
int main()
{
    while(cin>>n>>s>>t)
    {
        if(s==t&&n==1)
        {
            cout<<"0"<<endl;
            continue;
        }
        if(s<=t)
        {
            if(s==t)
            {
                cout<<"-1"<<endl;
                continue;
            }
            if(s==1&&t==n)
            {
                cout<<"0"<<endl;
                continue;
            }
            if((s==1&&t<n)||s+1==t)
            {
                cout<<"1"<<endl;
                continue;
            }
            cout<<"2"<<endl;
        }
        else
        {
            if(s==n&&t==1)
            {
                cout<<"0"<<endl;
                continue;
            }
            if((s==n&&t>1)||s-1==t)
            {
                cout<<"1"<<endl;
                continue;
            }
            cout<<"2"<<endl;
        }
    } 
}