# function reverse(n)
# {
#  k=n
#  i=10;
#  while (k)
#   {
#    tab[i] = read;
#    i++;
#    k--;
#   }
#
#  k=n div 2
#  i=10      // indeks pierwszego
#  j=10+n-1  // indeks ostatniego elementu
#  while (k--)
#    {
#     tmp    = tab[i]
#     tab[i] = tab[j]
#     tab[j] = tmp
#
#     i++;
#     j--;
#    }
#
# proponowane wyrażenie watch:
# n=9 k=8 i=1 j=2 tmp=3 tab=10:20
#
# przykładowe dane
# 5 1 2 3 4 5

	### wczytywanie ###

	read 9          # r9 = n
	load 9
	jzero end

	load =10        #
	store 1         # r1 = i

	load  9         #
	store 8         # r2 = k

readtab: read *1         # tab[i] = read

	load  1         #
	add  =1         #
	store 1         # i++

	load  8         #
	sub  =1         #
	store 8         # k--
	jgtz  readtab

	### odwracanie ###

	load =10        #
	store 1         # r1 = i=10

	load =9         #
	add   9         # r2 = j=10+n-1
	store 2

	load  9         #
	div  =2         #
	store 8         # r8 = k=n div 2

rev:	load   8        #
	jzero  end      #
	sub   =1        #
	store  8        # if (k--) goto end

	load  *1        #
	store  3        # tmp    = tab[i]

	load  *2        #
	store *1        # tab[i] = tab[j]

	load   3        #
	store *2        # tab[j] = tmp

	load   1        #
	add   =1        #
	store  1        # i++

	load   2        #
	sub   =1        #
	store  2        # j--
	jump rev

end:	halt