import sequtils
template `max=`*(x,y) = x = max(x,y)
template `min=`*(x,y) = x = min(x,y)
template `^`(n:int) : int = (1 shl n)

proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "<stdio.h>" .}
proc scan(): int =
  while true:
    let k = getchar_unlocked()
    if k < '0': break
    result = 10 * result + k.ord - '0'.ord

let n = scan()
let AB = newSeqWith(n,(a:scan(),b:scan()))
let L = AB.mapIt(it.a)
let R = AB.mapIt(it.b-it.a)
proc solve(s:int,l,r:int):int =
  if s == ^n - 1 : return 0
  result = 1e10.int
  for x in 1..<n:
    if (s and ^x) > 0 : continue
    let lPut = solve(s or ^x,L[x],r).max(l+R[x])
    let rPut = solve(s or ^x,l,R[x]).max(L[x]+r)
    result .min= lPut
    result .min= rPut
echo solve(^0,L[0],R[0])