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: Accepted)

/******************************************************************************

                            Online Java Compiler.
                Code, Compile, Run and Debug java program online.
Write your code in this editor and press "Run" button to execute it.
7
500 600
*******************************************************************************/
import java.util.*;
public class Main
{
	public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	int k = sc.nextInt();
	int a = sc.nextInt();
	int b = sc.nextInt();
	boolean flag = false;
	for(int i = a;i<= b;i++){
	    if(i%k  == 0){
	        flag  = true;
	        break;
	    }
	    
	    }
	    
	    if(!flag){
	        System.out.println("NG");
	    }else
	     System.out.println("OK");
	}
	
	}