7900
Russia  's leading airline  Aeroflot  reported Tuesday that its first half net profit rose 24 percent from a year earlier to 17.5 million dollars reflecting cost savings and improved efficiency .
 country of headquarters: Russia, Aeroflot
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 country of headquarters: Russia, Aeroflot