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() {
    val k = readLine()!!.toInt()
    val (a, b) = readLine()!!.split(" ").map { it.toInt() }
    var ans = "OK"
    val aa = a % k
    val bb = b % k
    if ( b - a < k) {
        if (a == 0 || b == 0) {

        } else {
            if (a < b){
                ans = "NG"
            }
        }
    }
    println(ans)
}