C. 780.

(5 points)

Deadline expired.

Statistics on problem C. 780. 435 students sent a solution. 5 points: 274 students. 4 points: 36 students. 3 points: 66 students. 2 points: 8 students. 1 point: 13 students. 0 point: 19 students. Unfair, not evaluated: 19 solutions.