Directions: Read the given sentence to find out whether there is any grammatical error or idiomatic error in it. The error, if any, will be in one part of the sentence. The number of that part is the answer. If there is no error, the answer is (5). (Ignore errors of punctuation, if any)

(1) In our experience people usually / (2) value things that they have to / (3) pay off more than those that / (4) they receive free of cost. (5) No error