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 Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws Exception {

        Scanner scan = new Scanner(System.in);
        int K = Integer.parseInt(scan.nextLine());
		String s = scan.nextLine();

		String[] AB = s.split(" ");
		int[] ab = new int[AB.length];
		
        for(int i = 0; i < AB.length; i++){
            ab[i] = Integer.parseInt(AB[i]);
        }
        
        for(int i = ab[0]; i <= ab[1]; i++){
            if(i % K == 0){
                System.out.println("OK");
                break;
            }else{
                continue;
            }
        }
        
    }
}