5836: ABC165 —— A - We Love Golf
[Creator : ]
Description
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.
His ob
If he can achieve the ob
Input
Input is given from Standard Input in the following format:
$K$
$A\ B$
$K$
$A\ B$
Output
If he can achieve the objective, print OK; if he cannot, print NG.
Constraints
All values in input are integers.
$1≤A≤B≤1000$
$1≤K≤1000$
$1≤A≤B≤1000$
$1≤K≤1000$
Sample 1 Input
7
500 600
Sample 1 Output
OK
Among the multiples of $7$, for example, $567$ lies between $500$ and $600$.
Sample 2 Input
4
5 7
Sample 2 Output
NG
No multiple of $4$ lies between $5$ and $7$.
Sample 3 Input
1
11 11
Sample 3 Output
OK
HINT
题目来源：AtCoder ABC165 A题。