#include <bits/stdc++.h>
using namespace std;
template <class T>
bool ckmin(T& a, const T& b) {
  return a > b ? a = b, true : false;
}
template <class T>
bool ckmax(T& a, const T& b) {
  return a < b ? a = b, true : false;
}
template <typename T>
struct IsC {
  template <typename C>
  static char test(typename C::const_iterator*);
  template <typename C>
  static int test(...);
  static const bool value = sizeof(test<T>(0)) == sizeof(char);
};
template <>
struct IsC<string> {
  static const bool value = false;
};
template <typename C>
typename enable_if<IsC<C>::value, ostream&>::type operator<<(ostream&,
                                                             const C&);
template <typename T1, typename T2>
ostream& operator<<(ostream&, const pair<T1, T2>&);
template <typename... T>
using TS = tuple_size<tuple<T...>>;
template <size_t idx, typename... T>
typename enable_if<TS<T...>::value == idx + 1, ostream&>::type operator<<(
    ostream& o, const tuple<T...>& t) {
  return o << ", " << get<idx>(t) << ')';
}
template <size_t idx, typename... T>
typename enable_if<0 < idx && idx + 1 < TS<T...>::value, ostream&>::type
operator<<(ostream& o, const tuple<T...>& t) {
  return operator<<<idx + 1>(o << ", " << get<idx>(t), t);
}
template <size_t idx = 0, typename... T>
typename enable_if<1 < TS<T...>::value && !idx, ostream&>::type operator<<(
    ostream& o, const tuple<T...>& t) {
  return operator<<<idx + 1>(o << '(' << get<idx>(t), t);
}
template <typename T>
ostream& operator<<(ostream& o, const tuple<T>& t) {
  return o << get<0>(t);
}
template <typename T1, typename T2>
ostream& operator<<(ostream& o, const pair<T1, T2>& p) {
  return o << make_tuple(p.first, p.second);
}
template <typename C>
typename enable_if<IsC<C>::value, ostream&>::type operator<<(ostream& o,
                                                             const C& c) {
  o << '[';
  for (auto it = c.cbegin(); it != c.cend(); ++it)
    o << *it << (next(it) != c.cend() ? ", " : "");
  return o << ']';
}
template <typename T>
void tprint(vector<vector<T>>& v, size_t width = 0, ostream& o = cerr) {
  if (!0) return;
  for (const auto& vv : v) {
    for (const auto& i : vv) o << setw(width) << i;
    o << '\n';
  }
}
int main() {
  ios_base::sync_with_stdio(0);
  cout.tie(0);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  if (n == 1) {
    cout << 1 << '\n';
    return 0;
  }
  if (n % 2 == 0) {
    if (m <= n / 2) {
      cout << m + 1 << '\n';
    } else {
      cout << m - 1 << '\n';
    }
    return 0;
  }
  if (m < (n + 1) / 2) {
    cout << m + 1 << '\n';
  } else {
    cout << m - 1 << '\n';
  }
  return 0;
}
