/* prog3.9b.c */
#include <stdio.h>
#include <stdlib.h>
typedef struct node* link;
struct node { int item; link next; };
int main(int argc, char *argv[])
  { int i, N = atoi(argv[1]), M = atoi(argv[2]); 
    link t = malloc(sizeof *t), x = t;
    t->item = 1; t->next = t;
    for (i = 2; i <= N; i++) {
      x = (x->next = malloc(sizeof *x));
      x->item = i; x->next = t;
    }
    while (x != x->next) {
      for (i = 1; i < M; i++) x = x->next;
      t = x->next;
      x->next = x->next->next; N--;
      free(t);
    }
    printf("%d\n", x->item);
    return 0;
  }