Почтовые весы

https://docs.google.com/spreadsheet/ccc?key=0AsyBhAjUtD_PdFAxMnJUb0w2Zi1BeERqZGFheHdWZGc&usp=drive_web#gid=0

https://docs.google.com/document/d/1bShTInhzMPb1M9ESeixe4FyHkDMM-5sp3FCSI_fzA2E/edit