# print a pattern of increasing integers,
# resembling the children's game "hopscotch"
# (problem 6 on 08au midterm)
def hopscotch(n):
    print "   1"
    for i in range(1, n+1):
        print "%d     %d" % (3*i - 1, 3*i)
        print "   %d" % (3*i + 1)

# main
while True:
    n = int(raw_input("n = "))
    hopscotch(n)