#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <map>
#include <vector>
#include <stack>
#include <queue>
#define sqr(x) (x)*(x)

using namespace std;
const int N = 1e5+10;
const int M = 1e6+10;

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