Problem:
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

Solution in Haskell (GHC 8.8.3) (judge verdict: Accepted)

toInt :: (String -> Int)
toInt x = read x ::Int

getInts = do
  x <- getLine
  let y = (map$toInt)$words x
  return y
    where
      toInt x = read x ::Int
getInt = do
	x <- getLine
	let y = toInt x
	return y

main = do
	k <- getInt
	ab <- getInts
	let r = [x | x <- [(ab!!0)..(ab!!1)],x`mod`k==0]
	putStr$(\t->if length t>0 then "OK" else "NG") r