/* -*- coding: utf-8 -*-
 *
 * 531.cc: No.531 エヌスクミ島の平和協定 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int n, m;
  cin >> n >> m;

  if (n <= m) puts("1");
  else if (! (n & 1) && n / 2 <= m) puts("2");
  else puts("-1");
  return 0;
}