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