{.warning[SmallLshouldNotBeUsed]: off.}

import strutils, sequtils, algorithm, future

proc f(v, w: seq[int], m, vm: int): bool =
  var
    n = v.len
    dp = newSeqWith(n+1, newSeq[int](m+1))
  for i in countDown(n-1, 0):
    for j in 0..m:
      if j < w[i]:
        dp[i][j] = dp[i+1][j]
      else:
        dp[i][j] = max(dp[i+1][j], dp[i+1][j-w[i]] + v[i])
  result = dp[0][m] < vm

proc g(v, w: seq[int], m, vm: int): bool =
  var
    n = v.len
    dp = newSeqWith(n+1, newSeq[int](m+1))
  for i in countDown(n-1, 0):
    for j in 0..m:
      if j < w[i]:
        dp[i][j] = dp[i+1][j]
      else:
        dp[i][j] = max(dp[i+1][j], dp[i+1][j-w[i]] + v[i])
  result = dp[0][m] <= vm

when isMainModule:
  var
    n = stdin.readLine.parseInt
    v = newSeq[int](n)
    w = newSeq[int](n)

  for i in 0..<n:
    var t = stdin.readLine.split.map(parseInt)
    (v[i], w[i]) = (t[0], t[1])

  var
    vm = stdin.readLine.parseInt
    (l, r) = (-1, 200000)

  while r - l > 1:
    var m = (l + r) div 2
    if f(v, w, m, vm): l = m
    else: r = m

  var a = -1
  for i in max(1, l-5)..l+5:
    if not f(v, w, i, vm):
      a = i
      break
  echo a

  (l, r) = (-1, 200000)
  while r - l > 1:
    var m = (l + r) div 2
    if g(v, w, m, vm): l = m
    else: r = m

  var b = l-5
  for i in max(1, l-5)..l+5:
    if g(v, w, i, vm):
      b = i
    else:
      break
  if not g(v, w, b+1, vm):
    echo b
  else:
    echo "inf"