#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  {
    if (n == 1) {
      cout << 1 << endl;
      return 0;
    }
  }
  if (!(n % 2) && m <= n / 2)
    cout << m + 1 << endl;
  else if (!(n % 2) && m > n / 2)
    cout << m - 1 << endl;
  else if (n % 2 && m > n / 2)
    cout << m - 1 << endl;
  else
    cout << m + 1 << endl;
  return 0;
}
