C. 637.

(5 points)

Deadline expired.

Statistics on problem C. 637. 758 students sent a solution. 5 points: 497 students. 4 points: 100 students. 3 points: 64 students. 2 points: 37 students. 1 point: 26 students. 0 point: 32 students. Unfair, not evaluated: 2 solutions.