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>
#include <stdbool.h>

int main(void){
	unsigned int k, a, b, i;
	bool res = false;
	scanf("%d", &k);
	printf("");
	scanf("%d %d", &a, &b);
	if(k > 1000 && a > 1000 && b > 1000) return 0;
	i = a;
	do{
		if(i % k == 0) res = true;
		i++;
	}while(i < b);
	if(res) printf("OK\n");
	else printf("NG\n");
	return 0;
}