class Integer
  def mod_pow(n, mod)
    x = self
    res = 1

    while n > 0
      res = res * x % mod if n[0] == 1
      x = x * x % mod
      n >>= 1
    end

    res
  end

  def mod_inverse(mod)
    mod_pow(mod - 2, mod)
  end
end

N = gets.to_i
C = gets.split.map(&:to_i)
S = C.sum
MOD = 10 ** 9 + 7
mod = Array.new(10, 0)
b = 1

2.upto(S - 1) do |x|
  b *= x
  b %= MOD
end

1.upto(9) do |i|
  m = b

  1.upto(9) do |j|
    next if i == j
    next if C[j - 1] == 0

    m *= C[j - 1].mod_inverse(MOD)
  end

  mod[i] = m
end

ans = 0
base = 1

N.times do
  C.each.with_index(1) do |c, i|
    next if c == 0

    ans += mod[i] * base * i
    ans %= MOD
  end

  base *= 10
  base %= MOD
end

puts ans