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 std::io::Read;

fn main() {
    let mut line = String::new();
    std::io::stdin().read_to_string(&mut line);
    let mut iter = line.split_whitespace();
    let k: i64 = iter.next().unwrap().parse().unwrap();
    let a: i64 = iter.next().unwrap().parse().unwrap();
    let b = iter.next().unwrap().parse().unwrap();
    for i in a..=b {
        if i % k == 0 {
            println!("OK");
            return;
        }
    }
    println!("NG");
}