Problem C. 642. (October 2001)

C. 642. Subscribers can reach the text of the problem after signing in. The text will be public from October 15, 2001.]

(5 pont)

Deadline expired on November 15, 2001.

Statistics:

560 students sent a solution.
5 points:	293 students.
4 points:	121 students.
3 points:	50 students.
2 points:	18 students.
1 point:	18 students.
0 point:	59 students.
Unfair, not evaluated:	1 solutions.

Problems in Mathematics of KöMaL, October 2001