#include <algorithm>
#include <cstdio> 
using namespace std;
int main()
{
    int n, s, t;
    while(scanf("%d%d%d", &n, &s, &t) != EOF)
    {
        if (s > t) s = n - s + 1, t = n - t + 1;
        if(s == 1 && t == n)printf("0\n");else
        if(s == t)printf("-1\n");else
        if(s == 1 || abs(s - t ) == 1)printf("1\n");else
        printf("2\n");
    }
    return 0;
}