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