#AT1571. A - We Love Golf

A - We Love Golf

A - We Love Golf

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:

KK

AA BB

Output

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