Problem 5.4. For a physical education class, 29 seventh-graders came, some of them brought one ball each. Sometimes during the class, one of the seventh-graders would give their ball to another seventh-grader who didn't have one.

At the end of the class, \( N \) seventh-graders said: “I received balls less frequently than I gave them away!”. Find the maximum possible value of \( N \), given that none of the students lied.
Answer: 14.

## 7th grade, problem 6