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.io.StdIn._
import scala.util.control.Breaks
object Main extends App {
  val k = readLine.trim.split(' ').map(_.toInt).apply(0)
  val Array(a, b) = readLine.trim.split(' ').map(_.toInt)

  val break = new Breaks
  var is_find = false
  break.breakable{
    (a/k to b/k+1).foreach(i => {
      val ki = k*i
      if(a <= ki && ki <= b){
        is_find = true
        break.break()
      }
    })
  }

  println(if(is_find) "OK" else "NG")
}