///1085422276
#include<bits/stdc++.h>
using namespace std ;
typedef long long ll;
#define mem(a) memset(a,0,sizeof(a))
#define meminf(a) memset(a,127,sizeof(a));
#define TS printf("111111\n");
#define FOR(i,a,b) for( int i=a;i<=b;i++)
#define FORJ(i,a,b) for(int i=a;i>=b;i--)
#define READ(a,b,c) scanf("%d%d%d",&a,&b,&c)
#define inf 100000000
inline ll read()
{
    ll x=0,f=1;
    char ch=getchar();
    while(ch<‘0‘||ch>‘9‘)
    {
        if(ch==‘-‘)f=-1;
        ch=getchar();
    }
    while(ch>=‘0‘&&ch<=‘9‘)
    {
        x=x*10+ch-‘0‘;
        ch=getchar();
    }
    return x*f;
}
//****************************************
#define maxn 10000+5
int n,s,t,ans,a,b,c;
int main(){
   while(scanf("%d%d%d",&n,&s,&t)!=EOF){
        ans=0;
        if(s==t&&n!=1){cout<<-1<<endl;continue;}
        if(n==1){
            cout<<0<<endl;continue;
        }if(s<t){
         a=s-1;b=t-s-1;c=n-t;
        }
        else {
           a=n-s;b=s-t-1;c=t-1;
        }if(!a&&!c)ans=0;
        if((a||c))ans=1;
        if(a&&c&&b)ans++;
        if(c==0&&a&&b)ans=2;
       cout<<ans<<endl;
   }
  return 0;
}