local ior = io.input()
local n, m, k, s, t = ior:read("*n", "*n", "*n", "*n", "*n")
local bridge = {}
for i = 1, n - 1 do bridge[i] = {} end
for i = 1, m do
  local a, b, c = ior:read("*n", "*n", "*n")
  local tmp = {}
  tmp.b, tmp.c = b, c
  table.insert(bridge[a], tmp)
end
local mmi = math.min
local poslist = {}
poslist[s] = 0
for i = 1, n - 1 do
  local npos = {}
  for floor, cost in pairs(poslist) do
    local br = bridge[i]
    for j = 1, #br do
      local ncost = cost + math.abs(floor - br[j].b)
      if(npos[br[j].c] == nil) then
        npos[br[j].c] = ncost
      else
        npos[br[j].c] = mmi(npos[br[j].c], ncost)
      end
    end
  end
  poslist = npos
end
local lastval = -1
for floor, cost in pairs(poslist) do
  local ncost = cost + math.abs(floor - t)
  if(lastval < 0) then lastval = ncost
  else lastval = mmi(lastval, ncost)
  end
end
print(lastval)