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: Accepted)

#include <stdio.h>
int main(void) {

    int value = 0;

    int min = 0;
    
    int max = 0;

    char str[1000];

    scanf("%d%*c",&value);
 
    fgets(str,sizeof(str),stdin);

    sscanf(str,"%d %d",&min,&max);

    for (int i = min; i <= max; i++) {

        if (i % value == 0) {

            printf("%s\n","OK");

            return 0;

        }



    }

    printf("%s\n", "NG");

    return 0;
}