#include<queue>
#include<stdio.h>
#include<string.h>
#include<algorithm>
#include<stdlib.h>
using namespace std;
int n,s,t;
int main()
{
    while(scanf("%d%d%d",&n,&s,&t)!=EOF)
    {
        if(s==t)
        {    
            if(n==1)
            printf("0\n");
            else
            printf("-1\n");
            continue;
        }
        if(n==2)
        {
            printf("0\n");
            continue;
        }
        if(abs(s-t)==1)
        {
            printf("1\n");
            continue;
        }
        if(s==1||s==n)
        {
            if(t==1||t==n)
            printf("0\n");
            else
            printf("1\n");
            
            continue;
        }
        else
        printf("2\n");
    }
    return 0;
}