import java.util.Scanner;

public class Computers {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = 0;
        int com = in.nextInt();
        int mod = in.nextInt();

        if (mod == 1 && com == 1 ){
            System.out.println(mod);
            return;
        }

        for(int x = 1;x < com;){
            if (x == 1){
                x++;
                a++;
            }
            if (x - mod == 0 && com - x > mod){
                x+=mod;
                a++;
            }else if (x - mod == 0 && com - x < mod){
                x+= com - x;
                a++;
            }
            if (x < mod && com - x > mod){
                x+=x;
                a++;
            }else if (x < mod && com - x < mod){
                x+= com - x;
                a++;
            }
            if (x > mod && com - x > mod){
                x+=mod;
                a++;
            }else if (x > mod && com - x < mod){
                x+= com - x;
                a++;
            }

        }
        System.out.println(a);
    }

}