/* -*- coding: utf-8 -*-
 *
 * 521.cc: No.521 Cheeses and a Mousetrap(チーズとネズミ捕り) - 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, k;
  cin >> n >> k;

  if (k <= 0 || k > n) puts("0");
  else {
    int l = k, r = n + 1 - k;
    printf("%d\n", n - (l == r ? 1 : 2));
  }
  return 0;
}