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 Scala (2.13.1) (judge verdict: Accepted)

import scala.util.control.Breaks

object Main extends App {
  val k =  scala.io.StdIn.readInt()
  val ab =  scala.io.StdIn.readLine()
  val abArray = ab.split(" ").map(_.toInt).toSeq
  val a = abArray(0)
  val b = abArray(1)
  var okFlg = false

  val break = new Breaks
  break.breakable {
    (a to b).foreach { i =>
      if (i % k == 0) {
        okFlg = true
        break.break()
      }
    }
  }
  if (okFlg) println("OK") else println("NG")
}