N = gets.to_i
c = gets.split.map(&:to_i).sort

dp = [[0, 0]] * (N+1)
(1 .. N).each do |s|
    dp1 = []
    (0 .. N-s).each do |l|
        b1, a1 = dp[l]
        b2, a2 = dp[l+1]
        a1 += c[l+s-1]
        a2 += c[l]
        dp1[l] = [
            [a1, b1],
            [a2, b2],
            ].max_by { |(a, b)| a.abs - b.abs }
    end
    dp = dp1
end
a, b = dp[0]
puts a.abs - b.abs