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