using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var n = int.Parse(line[0]);
        var k = int.Parse(line[1]);
        getAns(n, k);
    }
    static void getAns(int n, int k)
    {
        if (n == 1) { Console.WriteLine(1); return; }
        if (n == 2)
        {
            if (k == 1) Console.WriteLine(2);
            else Console.WriteLine(1);
            return;
        }
        if (n % 2 == 0) Console.WriteLine(k <= n / 2 ? n - 1 : n);
        else Console.WriteLine(k < (n + 1) / 2 ? n - 1 : n);
    }
}