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