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: Wrong Answer)

#include<stdio.h>
int main(void){
    int k,a,b,x[1000],y[1000],z[1000];
    scanf("%d",&k);
    scanf("%d%d",&a,&b);
    if(k==1){
        printf("OK");
        return 0;
    }
    
    else{
        for(int i=0;i<b-a;i++){
            x[i]=a+i;
        }
        for(int s=0;s<b-a;s++){
            y[s]=x[s]/k;
        }
        for(int t=0;t<b-a-1;t++){
            z[t]=y[t+1]-y[t];
            if(z[t]>=1){
                printf("OK");
                return 0;
            }    
        }
        printf("NG");
        return 0;
    }
}