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: Accepted)

#include <stdio.h>

int hikyori(int dist)
{
  int A,B;
  int i;
  scanf("%d %d",&A,&B);

  if(1 <= dist && dist<= 1000)
  {
    if( 1 <= A && A <= B && B<= 1000)
    {
      for(i = A; i<=B;i++)
      {
        if( i % dist == 0)
        {
          printf("OK\n");
          return 0;
        }
      }
    }
  }
  printf("NG\n");
  return 0;
}

int main(void)
{
  int K;
  
  scanf("%d",&K);
  hikyori(K);
  return 0;
}