#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 - m)
      cout << m - 1 << endl;
    else
      cout << m + 1 << endl;
  }
  return 0;
}
