Почтовые весы

https://docs.google.com/document/d/1190TyhaW_XqRwD9wwFPAzseK-vepwJWXB_4zuU-WAmM/edit

https://docs.google.com/spreadsheet/ccc?key=0An0kpBLLtKHGdHRjYkNnb3o3TVRHWkJJdnNZcUpxRVE&usp=drive_web#gid=0