/*
 * This code is from "Algorithms in C, Third Edition,"
 * by Robert Sedgewick, Addison Wesley Longman, 1998.
 */
#include <stdlib.h>
typedef struct node* link;
struct node { int item; link next; };
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;
        x->next = x->next->next;
      }
    printf("%d\n", x->item);
  }