题目描述
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.
Examples
Input
7
500 600
Output
OK
Input
4
5 7
Output
NG
Input
1
11 11
Output
OK
输入格式
见题面
输出格式
见题面
样例输入
4
5 7
样例输出
NG