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;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Security.Cryptography.X509Certificates;

namespace hello_world
{class Program
	{
		static void Main(string[] args)
		{

			int k = int.Parse(Console.ReadLine());
			string[] input = Console.ReadLine().Split(" ");
			int a = int.Parse(input[0]);
			int b = int.Parse(input[1]);
			bool div = false;
			for(int i=a;i<=b; i++)
			{
				if (i % k == 0)
				{
					div = true;
					break;
				}
			}if (div == true)
				Console.WriteLine("OK");
			else
				Console.WriteLine("NG");

		
				
	
			
			
		}

		
	}

}