# c_0 = a_0 * b_0
# c_1 = a_0 * b_1 + a_1 * b_0
# c_2 = a_0 * b_2 + a_1 * b_1    + a_2 * b_0
# c_3 = a_0 * b_3 + a_1 * b_2    + a_2 * b_1 + a_3 * b_0
# c_4 = a_0 * b_4 + a_1 * b_3    + a_2 * b_2 + a_3 * b_1 + a_4 * b_0
# ...
# c_n = \sum_{i = 0}^{n} ( a_{i} * \sum_{0}^{n-i} b_{i} )


MOD = 1000_000_007
n=gets.to_i
A = (0 .. n).map{ gets.to_i }
B = (0 .. n).map{ gets.to_i }
(1 .. n).each do |i|
  B[i] += B[i - 1]
end


puts (0 .. n).inject(0){|s, i| (s + A[i] * B[n - i]) % MOD } % MOD