Dmitry, If these are conscription numbers, why not use the addr:conscriptionnumber tag? It is document in the wiki [1] and appears to be in use. It would also appear more accurate and less likely to lead to misuse.
[1] http://wiki.openstreetmap.org/wiki/Key%3Aaddr%3Aconscriptionnumber Clifford -- @osm_seattle osm_seattle.snowandsnow.us OpenStreetMap: Maps with a human touch
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