#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <map>
#include <stack>
#include <queue>
#include <cmath>
#include <cstring>
#include <iomanip>

#define FORR(i, a, b) for(int (i) = (a); (i) < (b); (i)++)
#define REP(i, n) FORR(i, 0, n)
#define mp make_pair;

using namespace std;

int main() {
    int n, s, t;
    while (cin >> n >> s >> t) {
        if (s == t) {
            if (n == 1) cout << "0\n";
            else cout << "-1\n";
        }
        else if ((s == 1 && t == n) || (s == n && t == 1)) cout << "0\n";
        else if (s == 1 || s == n) cout << "1\n";
        else if (s + 1 == t || t + 1 == s) cout << "1\n";
        else cout << "2\n";
    }
    return 0;
}