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**multiplication and addition principle for count possibilities??/**

we toss a fair coin 5 times and recored the sequence of head and tails obtained.how may sequences are possible that start with head OR end with head.?

so what i did was using addition theorm i divided this complex process into 3 simple partitions like below

X1=start with head AND end with head

X2=start with head AND end with tail

X3=start with tail AND end with head

so my answer should be X1+X2+X3...

but I am supposed to find X1,X2,and X3 by using the multiplication theorem but I am little bit confused about how to use it

can anyone help me out.thanks!~!