#include<iostream>
using namespace std;
int main()
{
long long n,k;
cin>>n>>k;
long long t=(n+1)/2;
if(k<=t)
cout<<2*k-1;
else
cout<<(k-t)*2;
return 0;
}
#include < bits / stdc ++. h > using namespace std ; int main () { string str ; getline ( cin , str ); int index = str . find ( "WUB" ); int count = 0 ; while ( index !=- 1 ) { str . replace ( index , 3 , " " ); //str.erase(str.begin()+index,str.begin()+index+3); index = str . find ( "WUB" ); } cout << str ; return 0 ; }
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