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: Runtime Error)

#include <stdio.h>

int main()
{
    int a;
    int b;
    int k;
    int yes = 0;
    int no;

    do{
        scanf("%d", &a);

    }while(a<0 || a>1001);

    do{
        scanf("%d", &b);

    }while(b<a || b>1001);

    do{
        scanf("%d", &k);

    }while(k<0 || k>1001);

    int i = a;
    for(i<b; ++i;) {
        if(i%k == 0) {
            yes = 1;
        } else {
        }
    }

    if(yes == 1) {
        printf("%s\n", "yes");
    } else {
    printf("%s\n", "no");
    }

    return 0;
}