318A Even-Odds.cpp

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