C. 728.

(5 points)

Deadline expired.

Statistics on problem C. 728. 686 students sent a solution. 5 points: 418 students. 4 points: 13 students. 3 points: 8 students. 2 points: 112 students. 1 point: 21 students. 0 point: 108 students. Unfair, not evaluated: 6 solutions.