1. At a round table, knights who always tell the truth and liars who always lie are sitting, a total of 239 people. Each of them said: "Both my neighbors are liars." What is the minimum and maximum number of liars that could be at the table? Provide your answers in any order, separated by a semicolon.
Answer: $120,159|120 ; 159| 159 ; 120 \mid 159,120$