ac

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.*;

public class Main {
    public static Scanner sc = new Scanner(System.in);

    public static BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

    public static void main(String[] args) throws Exception {
        int n = sc.nextInt();
        int m = sc.nextInt();
//        System.out.println(f(n, m) + 1);
        System.out.println(josephusKill(n, m));
    }

    static int josephusKill(int n, int m){
        if (n == 1) {
            return 1;
        }
        int last = 0;
        for (int i = 2; i <= n; ++i){
            last = (last + m) % i;
        }
        return last + 1;
    }

    static int f(int n, int m){
        if(n == 1){
            return 0;
        }
        return (f(n-1, m) + m) % n;
    }
}