#include <stdio.h>
#include <stdlib.h>

struct node { int key; struct node *next; };

int main(int argc, char** argv)
{
	int i, N, M;
	struct node *t, *x;
	
	scanf("%d %d", &N, &M);
	
	t = (struct node *) malloc(sizeof *t);
	t->key = 1; x = t;
	
	for(i = 2; i <= N; i++){
		t->next = (struct node *) malloc(sizeof *t);
		t = t->next;
		t->key = i;
	}
	t->next = x;
	
	while(t != t->next){
		for(i = 1; i < M; i++){ t = t->next;};
		printf("%d", t->next->key);
		x = t->next;
		t->next = t->next->next;
		free(x);
	}
	
	printf("%d\n", t->key);
	
	return 0;
	
}