#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 <= double(n / 2.0))
      cout << m + 1;
    else
      cout << m - 1;
    return 0;
  }
}
