text: #include <bits/stdc++.h>
  using namespace std;
  
  int main()
  {
      long long n, k;
      cin >> n >> k;
      if (k <= (n + 1) / 2)
      {
          cout << k * 2 - 1 << endl;
      }
      else
      {
          cout << (k - (n + 1) / 2) * 2 << endl;
      }
      return 0;
  }