#include<cstdio>
#include<cmath>
#include<iostream>
#include<string>
#include<cstring>
#include<algorithm>
#include<cstdlib>
#include<ctime>
#include<ctype.h>
#include<queue>
#include<stack>
#include<map>
#include<set>
#include<vector>
#include<list>
#define INF 0x3f3f3f3f
typedef long long LL;
using namespace std;
int main()
{
    int n,s,t;
    while(cin>>n>>s>>t)
    {
        if(s==t&&n==1)cout<<"0"<<endl;
        else if(s==t)cout<<"-1"<<endl;
        else if(s==1&&t==n)cout<<"0"<<endl;
        else if(s==n&&t==1)cout<<"0"<<endl;
        else if(s==1||s==n)cout<<"1"<<endl;
        else if(t-s==1||s-t==1)cout<<"1"<<endl;
        else cout<<"2"<<endl;
    }
    return 0;
}