MOD = 10 ** 9 + 7
MEMO = {0 => 1}

def pow_10_mod(e)
  return 1 if e.zero?
  return 10 if e == 1
  MEMO[e] ||= (pow_10_mod(e - e / 2) * pow_10_mod(e / 2)) % MOD
end

def e_mod(n)
  (4 * pow_10_mod(n) - 1) / 3
end
N = gets.to_i
puts e_mod(N)