ior = io.read
local n = ior("*n")
local t = {}
for i = 1, 9 do t[i] = 1 end
local ret = 10
for i = 2, n do
  for j = 1, 9 do
    local sum = 0
    for k = j, 9 do
      sum = (sum + t[k]) % 1000000007
    end
    t[j] = sum
    ret = (ret + sum) % 1000000007
  end
end
print(ret)