Product Max SOLUTION
Problem Statement
Given are integers a,b,c and d. If x and y are integers and a≤x≤b and c≤y≤d hold, what is the maximum possible value of x×y?
Constraints
−109≤a≤b≤109
−109≤c≤d≤109
All values in input are integers.
Input
Input is given from Standard Input in the following format:
a
b
c
d
Output
Print the answer.
Sample Input 1
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1 2 1 1
Sample Output 1
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2
If x=1 and y=1 then x×y=1
. If x=2 and y=1 then x×y=2
. Therefore, the answer is 2
.Sample Input 2
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3 5 -4 -2
Sample Output 2
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-6
The answer can be negative.
Sample Input 3
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-1000000000 0 -1000000000 0
Sample Output 3
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1000000000000000000
