import java.util.*;
import java.lang.*;
import java.io.*;
 
public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt(), k = in.nextInt();
		ArrayList<Integer> ns = new ArrayList<Integer>(n);
		for (int i = 1; i <= n; i++) 
			ns.add(i);
 
		int i = 0, j = 0;
		while(n > 1) {
			j = (++j) % k;
			if(j == 0) {
				n--;
				ns.remove(i);
			} else {
				i = (++i) % n;
			}
		}
		System.out.println(ns.get(0));
	}
}

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