#include <iostream>
#include <cstdio>
#include <cmath>

using namespace std;

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