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