#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
using namespace std;

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