8223
His parents Thomas and Marina Ladis emigrated to the  United States  when Ladis was a small boy and settled in Richmond Virginia where he graduated from  Thomas Jefferson High School  .
 country of headquarters: United States, Thomas Jefferson High School
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: United States, Thomas Jefferson High School