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(){
    int K;
    int A, B;
    scanf("%d", &K);
    scanf("%d %d", &A, &B);
    
    for(int i = 1 ; i < 1000 ; i++){
    	int temp = K;
    	temp *= i; // 7*3 = 21 -> kelipatan k
    	// printf("Temp number: "%d\n", temp);
    	if(temp >= A && temp <= B){ //statement && -> salah 1 false tidak jalan
    		printf("OK\n");
    		// printf("%d\n", i);
    		break;
		}
		else if(temp > B){
			printf("NG\n");
			//printf("%d\n", i);
			break;
		}
    	//balik ke atas
	}
    return 0;
}