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: Accepted)

// use procontools::prelude::*;
use proconio::input;
macro_rules! p {
    ($x:expr) => {
        println!("{}", $x);
    };
}
fn main() {
    input! {
    k:i64,a:i64,b:i64
        }
    let mut c = 0;
    loop {
        c += k;
        if a <= c && c <= b {
            p!("OK");
            return;
        }
        if c > b {
            p!("NG");
            return;
        }
    }
}