Suppose we have six computers, 2 computers have Floating-point arithmetic unit, 5 computers have Magnetic disk memory, and 3 computers have Graphic display terminal. The Six Computers specifications are showed as follows:

How many computers have one or more of three kinds of hardware (i.e., Floating-point arithmetic unit, Magnetic disk memory, Graphic display terminal)?

Computer Floating-point arithmetic unit Magnetic disk memory Graphic display terminal \begin{tabular}{llll} \hline I & Yes & Yes & No \\ II & Yes & Yes & Yes \\ III & No & No & No \\ IV & No & Yes & Yes \\ V & No & Yes & No \\ VI & No & Yes & Yes \\ \hline \end{tabular}