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++ (GCC 9.2.1) (judge verdict: Accepted)

                    /********************/
                    /*user -> tushar284*/
                    /******************/
#include<bits/stdc++.h>
                                                    /*********/            
using namespace std;                             /*   __   __   */
#define  f              first                    /*   @ ) ( @   */
#define  s              second                   /*     / \     */            
#define  mp             make_pair                /*  __  -  __  */
#define  loop(i,s,e)    for(int i=s;i<e;i++)     /*    ..^..    */
#define  rev(i,s,e)     for(int i=s;i>=e;i--)     /*     |     */
#define  mod            1000000007                  /*   |   */
#define  pb             push_back                      /***/
#define  start	        int main()                     
#define  fast           ios_base::sync_with_stdio(false);cin.tie(0);
#define  test           fast int t; cin>>t;while(t--)
typedef vector<int> vi;
typedef pair<int,int> pi;
typedef long long ll;


start
{   
    int k,a,b;
    cin>>k>>a>>b;
    bool ok = false;
    loop(i,a,b+1)if(i%k==0)ok=true;
    if(ok)cout<<"OK";
    else cout<<"NG";
	return 0;
}