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 Go (1.14.1) (judge verdict: Accepted)

package main

import (
       "bufio"
       "fmt"
       "os"
       "strconv"
)

var sc = bufio.NewScanner(os.Stdin)

func nextInt() int {
     sc.Scan()
     i, e := strconv.Atoi(sc.Text())
     if e != nil {
     	panic(e)
     }
     return i
}

func main() {
	sc.Split(bufio.ScanWords)
	k := nextInt()
	a := nextInt()
	b := nextInt()
	ans := "NG"

	for i:=1; k*i<=b; i++{
		if k*i >= a {
			ans = "OK"
		}
	}

	fmt.Println(ans)
}