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++ (Clang 10.0.0) (judge verdict: Wrong Answer)

#include <iostream>
#include <string>
#include <stdio.h>
#include <set>
#include <map>
#include <vector>

using namespace std;

#define ll long long
// #define rep(i, n) for (ll i = 1; i < (n+1); i++)
// #define rep(j, n) for (ll j = 1; j < (n+1); j++)
// #define rep(k, n) for (ll k = 1; k < (n+1); k++)


// int main()
// {
//     ll K;
//     int a = 100;
//     cin >> K;
//     int year = 0;
//     while (a < K) {
//         a = a * 1.01;
//         // a = float(a);
//         // cout << a << endl;
//         year++;
//     }
//     cout << year << endl;
// }


int main()
{
    int K;
    cin >> K;
    int A, B;
    int C;
    int ans;
    cin >> A >> B;
    C = B / K;
    int d = 0;
    for (ll i = 1; i <= C; i++) {
        ans = K * i;
        if (A <= ans <= B) {
            cout << "OK" << endl;
            d++;
            break;
        }
    }
    if (d == 0) {
        cout << "NG" << endl;
    }
}