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 C# (.NET Core 3.1.201) (judge verdict: Accepted)


using System;

class IDONTKNOWCSHARP
{
    public static void Main()
    {
        int K = int.Parse(Console.ReadLine());

        int[] temp = Convert(GetLines());

        int A = temp[0];
        int B = temp[1];
        int V = A / K;

        while (true)
        {
            if (V * K >= A && V * K <= B)
            {
                Console.WriteLine("OK");
                return;
            }
            else
            {
                if (V * K > B)
                {

                    Console.WriteLine("NG");
                    return;
                }
            }
            V++;

        }
    }


    static int[] Convert(string[] v)
    {
        var temp = new int[v.Length];

        for (int i = 0; i < temp.Length; i++)
        {
            temp[i] = int.Parse(v[i]);
        }

        return temp;
    }




    static string[] GetLines()
    {
        return Console.ReadLine().Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
    }


}