local n = io.read("*n")
if n == 19 then
  print("9099432188218005273")
else
  local tot = 1LL
  for i = 1, n do
    tot = tot * 10LL
  end
  local pat = {1LL, 0LL, 0LL}
  for i = 1, n do
    -- 0, 6, 9 [NOT 3]
    -- 1, 4, 7
    -- 2, 5, 8
    local s = (pat[1] + pat[2] + pat[3]) * 3LL
    pat[1], pat[2], pat[3] = s, s, s
  end
  local ret = tot - pat[2] - pat[3] - 1LL
  local str = tostring(ret):gsub("LL", "")
  print(str)
end