#include<iostream>
using namespace std;


int main()
{
    int n, s, t;
    while (cin >> n >> s >> t)
    {
        int r = s - t;
        if (r == 0) {
            if (n == 1) cout << 0 << endl;
            else cout << -1 << endl;
            continue;
        }
        if (r == 1 || r == -1) {
            if (n == 2) cout << 0 << endl;
            else cout << 1 << endl;
            continue;
        }

        if (r < 0)
        {
            if (s == 1)
            {
                if (t == n) cout << 0 << endl;
                else cout << 1 << endl;
                continue;
            }
            else
            {

                cout << 2 << endl;
                continue;
            }
        }

        else
        {
            if (s == n)
            {
                if (t == 1) cout << 0 << endl;
                else cout << 1 << endl;
            }
            else
            {
                cout << 2 << endl;
                continue;
            }
        }
    }
}