#include <iostream>
#include <cstdio>
#include <cstring>
#include <queue>
#include <cstdlib>
#include <algorithm>
#include <stack>
#include <set>
#include <map>
#include <vector>
#include <string>
#define RR freopen("in.txt","r",stdin)
#define WW freopen("out.txt","w",stdout)
#define LL long long
#define INF 0x3f3f3f3f
#define Lson l,mid,rt<<1
#define Rspn mid+1,r,rt<<1|1

using namespace std;

int main()
{
    int n,s,t;
    while(~scanf("%d%d%d",&n,&s,&t))
    {
        if(n==1) printf("0\n");
        else if(s==t) printf("-1\n");
        else if(s==1)
        {
            if(t==n) printf("0\n");
            else printf("1\n");
        }
        else if(s==n)
        {
            if(t==1) printf("0\n");
            else printf("1\n");
        }
        else
        {
            if(abs(s-t)==1) printf("1\n");
            else if(t==n || t==1) printf("2\n");
            else printf("2\n");
        }
    }
    return 0;
}