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Codeforces 335 div2
# [Problem - A - Codeforces](http://codeforces.com/contest/606/problem/A)
a, b, c = gets.chomp.split(" ").map(&:to_i)
x, y, z = gets.chomp.split(" ").map(&:to_i)
need = 0
extra = 0
[a, b, c].zip([x, y, z]).each do |e1, e2|
if e2 > e1 then
need += e2 - e1
else
extra += (e1 - e2) / 2
end
end
if need <=extra then
puts "Yes"
else
puts "No"
end
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