C. 653.

(5 points)

Deadline expired.

Statistics on problem C. 653. 387 students sent a solution. 5 points: 196 students. 4 points: 21 students. 3 points: 21 students. 2 points: 69 students. 1 point: 50 students. 0 point: 27 students. Unfair, not evaluated: 3 solutions.