You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.

Description

Huang Rong has been poisoned and will die if the poison is not removed within $t$ time units. Guo Jing uses his internal energy to help her expel the poison, removing $m$ points of poison per time unit. Huang Rong has been poisoned with a total of $n$ points. Can you determine if Huang Rong can be saved?

Input Format

Three integers $t$, $n$, $m$ ($1 \le t, n, m \le 10^4$).

Output Format

If Huang Rong can be saved, output "yes"; otherwise, output "no".

Sample

100 1001 10

no