A. Even Odds Solution

#include<bits/stdc++.h>

using namespace std;

int main()

{

    long long int a,b,c,d;

    cin>>a>>b;

    if (a%2==0)

        c=a/2;

    else

        c=a/2+1;

    if (b<=c)

        d=b*2-1;

    else

        d=(b-c)*2;

    cout<<d<<endl;

    return 0;

}