SmallAI

Bikash, an aspiring programmer, aims to create an Artificial Intelligence program capable of solving a wide range of mathematical problems.

However, during the initial development stage, he encountered a limitation. The program can only handle sets of three small numbers within a specific limit. So he named it SmallAI. Recognizing the need to enhance SmallAI's capabilities, Bikash seeks your assistance.

Your task is to evaluate whether SmallAI can handle a given set of three numbers, $A$, $B$ and $C$. It is important to note that SmallAI can only work with numbers that are less than or equal to a specific limit, denoted by $X$.

Write a program that determines whether SmallAI can work with all the provided numbers or not.

Input

The input consists of a single line containing four space-separated integers: $X$, $A$, $B$, and $C$— The variable $X$ denotes the limit of SmallAI, while $A$, $B$, and $C$ represent three integers that AI can work with, respectively.

$1 \le X \le 1000$
$0 \le A,B,C \le 1000$

Output

Print "OK" if SmallAI can handle all the provided numbers. Otherwise, print "ERROR".

Samples

Input	Output
10 5 8 12	ERROR
In the first example: The limit of SmallAI is $X = 10$. The given set of numbers are $A = 5$, $B = 8$, and $C = 12$. SmallAI can easily process $A$and $B$because, $A \le X$ and $B \le X$, but as $C>X$, SmallAI cannot process all of the provided numbers. Therefore, the output is "ERROR".

Input	Output
10 4 5 6	OK