local n = io.read("*n")
local edge = {}
local num = {}
local len = {}
local lim, use = {}, {}
lim[1] = math.ceil(n / 3)
lim[2] = math.ceil((n - 1) / 3)
use[1], use[2], use[3] = 0, 0, 0

for i = 1, n do
  edge[i] = {}
  num[i] = 0
  len[i] = -1
end
for i = 1, n - 1 do
  local a, b = io.read("*n", "*n")
  edge[a][b], edge[b][a] = true, true
end
local tasks = {1}
len[1] = 0
num[1] = 1
use[1] = 1
for i = 1, n do
  local src = tasks[i]
  local srcnum = num[src] % 3
  for dst, _u in pairs(edge[src]) do
    if len[dst] == -1 then
      len[dst] = len[src] + 1
      if len[dst] % 2 == 0 then
        if use[2] < lim[2] then
          use[2] = use[2] + 1
          num[dst] = use[2] * 3 - 1
        else
          use[3] = use[3] + 1
          num[dst] = use[3] * 3
        end
      else
        if use[1] < lim[1] then
          use[1] = use[1] + 1
          num[dst] = use[1] * 3 - 2
        else
          use[3] = use[3] + 1
          num[dst] = use[3] * 3
        end
      end
      table.insert(tasks, dst)
    end
  end
end
print(table.concat(num, " "))
