101650: [AtCoder]ABC165 A - We Love Golf

Memory Limit:256 MB Time Limit:2 S
Judge Style:Text Compare Creator:
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Description

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

Input

题意翻译

求出在 $[A,B]$ 区间内是否存在 $k$ 的倍数。

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