def 🎍(a,b,c)
    a != c && ((a < b && b > c) || (a > b && b < c))
end

line1 = gets.chomp!
line2 = gets.chomp!
abort if gets

n = line1.to_i
arr = line2.split.map(&:to_i)

abort 'a' if arr.find{|a| 1 > a || a > n}
abort '🎍' if arr.each_cons(3).all?{|a| 🎍(*a)}

# - - - - -

not_kado_idxs = arr.each_cons(3).each_with_index.map{|a,i| 🎍(*a) ? nil : i}.compact

if not_kado_idxs.size > 20
    puts 'No'
    exit
end

validate_idxs = not_kado_idxs.map{|i| (-1..0).map{|e|i+e}.to_a}.flatten.uniq.select{|i| 0 <= i && i < n-2}

ok = false
n.times do |i|
    not_kado_idxs.each do |ji|
        3.times do |jj|
            j = ji+jj
            next if i == j
            arr[i], arr[j] = arr[j], arr[i]
            ok ||= validate_idxs.each.all?{|x| 🎍(arr[x], arr[x+1], arr[x+2])} &&
                   (-2..0).map{|e|i+e}.select{|i| 0 <= i && i < n-2}.all?{|x| 🎍(arr[x], arr[x+1], arr[x+2])}
            arr[i], arr[j] = arr[j], arr[i]
        end
    end
end

puts ok ? 'Yes' : 'No'