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 Kotlin (1.3.71) (judge verdict: Wrong Answer)

fun main(args: Array<String>) = ABC165A.main()

object ABC165A {
    fun log(message: Any?) {
        println(message)// TODO: ←消す
    }

    fun main() {
        val K = readInt()
        val (A, B) = readInts()

        val ans = K <= (B - A) || A % K == 0 || B % K == 0
        println(ans.yesOrNo())
    }


    /*####################################################################################*/

    fun readString() = readLine()!!
    fun readStrings() = readLine()!!.split(" ")
    fun readInt() = readLine()!!.toInt()
    fun readInts() = readLine()!!.split(" ").map { it.toInt() }
    fun readLong() = readLine()!!.toLong()
    fun readLongs() = readLine()!!.split(" ").map { it.toLong() }
    fun readMatrixRows(height: Int) = (1..height).map { readLine()!!.toList() }

    fun Boolean.yesOrNo() = if (this) "OK" else "NG"
    fun Double.toNaturalExpr() = println("%f".format(this))
}