#define _GLIBCXX_DEBUG
#include<bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;
int main(){
    int n,k;
    cin>>n>>k;
    if(n%2==0){
        (k>n/2?k=n/2:k+=0);
        cout<<(k==n/2?k:(k%2==0?k+1:k-1));
    }
    else{
        (k>n/2?k=n/2+1:k+=0);
        cout<<(k%2==0?2*k+1:2*(k-1));
    }
}