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: Accepted)

const main = (input) => {
    input = input.split('\n');
    const K = input[0];
    const tmp = input[1].split(' ');
    const A = parseInt(tmp[0]);
    const B = parseInt(tmp[1]);

    for (let i = A; i <= B; i++) {
        if (i % K === 0) {
            console.log('OK');
            return;
        }
    }

    console.log('NG');
};

// 標準入力
main(require('fs').readFileSync('/dev/stdin', 'utf8'));