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Score: $100$ points

### Problem Statement

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.

### Constraints

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

### Input

Input is given from Standard Input in the following format:

$K$
$A$ $B$


### Output

If he can achieve the objective, print OK; if he cannot, print NG.

### Sample Input 1

7
500 600


### Sample Output 1

OK


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

### Sample Input 2

4
5 7


### Sample Output 2

NG


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

### Sample Input 3

1
11 11


### Sample Output 3

OK