Even Odds

<div class="page"> <div class="layoutArea"> <div class="column"> <p> <span style="line-height:1.5;">Being a nonconformist, Volodya is displeased with the current state of things, particularly with the order of natural numbers (natural number is positive integer number). He is determined to rearrange them. But there are too many natural numbers, so Volodya decided to start with the first n. He writes down the following sequence of numbers: firstly all odd integers from 1 to n (in ascending order), then all even</span> </p> <p> integers from 1 to n (also in ascending order). Help our hero to find out which number will stand at the position number k. </p> <p> &nbsp; </p> <p> Input </p> <p> The only line of input contains integers n and k (1≤k≤n≤1e14). &nbsp; </p> <p> Output </p> <p> Print the number that will stand at the position number k after Volodya's manipulations. &nbsp; </p> <p> &nbsp; </p> <p> Sample test(s) input<br /> 10 3 </p> <p> 77 </p> <p> output </p> <p> 5 </p> <p> 6 </p> <p> Note </p> <p> In the first sample Volodya's sequence will look like this: {1, 3, 5, 7, 9, 2, 4, 6, 8, 10}. The third place in the sequence is therefore occupied by the number 5. </p> <p> Hint </p> <p> 注意数据的类型 </p> <p> use __int64 to read data and use %I64d to output data&nbsp; </p> </div> </div> </div>

<span>The only line of input contains integers n and k (1≤k≤n≤1e14). &nbsp;</span>

<span>Print the number that will stand at the position number k after Volodya's manipulations. &nbsp;</span>