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