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 Rust (1.42.0) (judge verdict: Wrong Answer)

// use procontools::prelude::*;
use proconio::input;
// macro_rules! p {
//     ($x:expr) => {
//         println!("{}", $x);
//     };
// }
fn main() {
    input! {
        n:u64,m:u64,
    }
    if n % 2 == 1 {
        for i in n / 2 - m + 1..=n / 2 {
            println!("{} {}", i, n - i);
        }
    } else {
    
        for i in n / 2 - m + 1..=n / 2 {
            let (l, r) = (i, n - i + 1);
            if r - l == n / 2 {
                println!("{} {}", i, 1);
            } else {
                println!("{} {}", i, n - i + 1);
            }
        }
    }
}