#include <iostream>
#include <string.h>
#include <stdio.h>

using namespace std;

int _abs(int a){
    return a > 0 ? a : -a;
}
int n, s, t;

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