Given that x and y are nonnegative integers, compute the number of pairs (x, y) such that
5x + y = 20.	Choices:  A) 2  B) 3  C) 5  D) 9  E) 8
For x = 0,1,2,3,4, there is a valid y, giving the answer 5 .   correct answer 5
<result>C</result>
Given that x and y are nonnegative integers, compute the number of pairs (x, y) such that
5x + y = 20.