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 JavaScript (Node.js 12.16.1) (judge verdict: Accepted)


function Main(input) {
    input = input.trim();
    input = input.split("\n")
    var a = input[0].split(" ");
    var b = input[1].split(" ");

a = a.map(e=>{
    return parseInt(e);
})

b = b.map(e=>{
    return parseInt(e);
})

    var flag = false;

    for(var i=b[0];i<=b[1];i++){
        if(i%a[0]==0){
            flag = true;
            break;
        }
    }
if(flag){
    console.log("OK");
}else{
    console.log("NG");
}

}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));