a = io.read()
n = #a
t = {}
for i = 0, n do
  for j = 0, 9 do
    local v = a:sub(1, i) .. tostring(j) .. a:sub(i + 1, n)
    while v:sub(1, 1) == "0" do
      v = v:sub(2, #v)
    end
    t[v] = true
  end
end
c = 0
for key, val in pairs(t) do
  c = c + 1
end
print(c - 1)