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 JavaScript (Node.js 12.16.1) (judge verdict: Wrong Answer)

"use strict";
const p = (s) => console.log(s);
// let a,b,c,d;
// [a,b,c,d] = input[0].trim().split(" ").map(i => parseInt(i));

function main(input) {
  const K = input[0].split(" ")[0];
  const A = input[1].split(" ")[0];
  const B = input[1].split(" ")[0];
  let flag = false;

  for (let i = A; i <= B; i++) {
    if (Math.floor(i % K) === 0) {
      p("OK");
      flag = true;
      break;
    }
  }
  if (!flag) {
    p("NO");
  }
}
main(require("fs").readFileSync("/dev/stdin", "utf8").trim().split("\n"));