#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 - 1 < n - m) {
    cout << m + 1;
  } else {
    cout << m - 1;
  }
}
