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