#include<bits/stdc++.h>
using namespace std;

int main(){

    long long n,k;

    cin>>n>>k;

    //cout<<n/2<<"\n";
    if(k<=n/2 && n%2==0){
        cout<<1+(k-1)*2<<"\n";
    }
    else if(k<=n/2+1 && n%2==1){
        cout<<1+(k-1)*2<<"\n";
    }
    else{
        long long t;
        if(n%2==0){
            t = k - n/2;
        }
        else t = k - n/2 - 1;
        cout<<2 +(t-1)*2<<"\n";
    }



}