Problem C. 639. (September 2001)

C. 639. Subscribers can reach the text of the problem after signing in. The text will be public from September 15, 2001.]

(5 pont)

Deadline expired on October 15, 2001.

Statistics:

898 students sent a solution.
5 points:	267 students.
4 points:	71 students.
3 points:	169 students.
2 points:	294 students.
1 point:	66 students.
0 point:	25 students.
Unfair, not evaluated:	6 solutionss.

Problems in Mathematics of KöMaL, September 2001