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