#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  if (n == 1) {
    cout << 1;
    return 0;
  }
  (m - 1 >= n - m) ? cout << m - 1 : cout << m + 1;
  return 0;
}
