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 C (GCC 9.2.1) (judge verdict: Wrong Answer)

#include <stdio.h>

main()
{	int k,a,b;
	
	scanf("%d",&k);
	scanf("%d",&a);
	scanf("%d",&b);
	
	if(a!=b)
	{
		if((a%k==0)||(b%k==0)||(b-a>k))
		{
			printf("OK");
		}
		else
		{
			printf("NG");
		}
	}
	
	if(a==b)
	{
		if(a%k==0)
		{
			printf("OK");
		}
		else
		{
			printf("NG");
		}
	}
	
}