from common import *

nodes = xml_to_obj_hierarchy(sys.argv[1])
ready_nodes_dtd_hierarchy(nodes)

min = 0xffffffffL
bezet = {}
for node in nodes.nodes:
	for link in node.links:
		if link.ip < min:
			min = link.ip
		bezet[link.ip] = 1
i = min + 4
while bezet.has_key(i) or bezet.has_key(i + 1):
	i = i + 4
print "%s/30: %s en %s" % (showaddr(i - 1), showaddr(i), showaddr(i + 1))