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: Accepted)

fun main(args: Array<String>) {
	val k = readLine()!!.toInt()
  	val (a, b) = readLine()!!.split(" ").map(String::toInt)
  	var i = 0
  	var flg = 0
  
  	val count = 1000 / k
  
  	for (i in 0..count) {
     	val len = i * k
      	if(len >= a && len <= b) {
        	print("OK")
          	flg = 1
          	break;
        }
    }
  	if (flg == 0) {
     	print("NG") 
    }
}