#include<cstdio>
#include<cstring>
#include<algorithm>

using namespace std;

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