Contest: Task: Related: TaskB

Score: $100$ points

Takahashi the Jumbo will practice golf.

His objective is to get a carry distance that is a multiple of $K$, while he can only make a carry distance of between $A$ and $B$ (inclusive).

If he can achieve the objective, print `OK`

; if he cannot, print `NG`

.

- All values in input are integers.
- $1 \leq A \leq B \leq 1000$
- $1 \leq K \leq 1000$

Input is given from Standard Input in the following format:

$K$ $A$ $B$

If he can achieve the objective, print `OK`

; if he cannot, print `NG`

.

7 500 600

OK

Among the multiples of $7$, for example, $567$ lies between $500$ and $600$.

4 5 7

NG

No multiple of $4$ lies between $5$ and $7$.

1 11 11

OK