local mce, mfl, msq, mmi, mma = math.ceil, math.floor, math.sqrt, math.min, math.max

local n = io.read("*n")
local a, b, c = {}, 0, {}
local tot = 1
local alltask = {}
local stagetask = {}
for i = 1, n do
  a[i], b = io.read("*n", "*n")
  c[i] = b - a[i]
  tot = tot * 2
  alltask[i] = {}
  stagetask[i] = {}
end
local inf = 3000
for i = 1, n do
  for j = 1, tot - 1 do
    alltask[i][j] = inf
  end
end
for i = 1, tot - 1 do
  local ti = i
  local cnt = 0
  for j = 1, n do
    if ti % 2 == 1 then
      cnt = cnt + 1
      ti = ti - 1
    end
    ti = ti / 2
  end
  table.insert(stagetask[cnt], i)
end

local function dotask(stage)
  local stlen = #stagetask[stage]
  for i_stagetask = 1, stlen do
    local used = stagetask[stage][i_stagetask]
    for i = 1, n do
      local val = alltask[i][used]
      if val ~= inf then
        local mul = 1
        local tmp = used
        for j = 1, n do
          if tmp % 2 == 0 then
            alltask[j][used + mul] = mmi(alltask[j][used + mul], mma(c[i] + a[j], val))
          else
            tmp = tmp - 1
          end
          tmp = tmp / 2
          mul = mul * 2
        end
      end
    end
  end
end

local tmp = 1
for i = 1, n do
  alltask[i][tmp] = 0
  tmp = tmp * 2
end
for i = 1, n - 1 do
  dotask(i)
end
local min = inf
for i = 1, n do
  min = mmi(min, alltask[i][tot - 1])
end
print(min)