import algorithm, sequtils, strutils

let
  m = stdin.readLine.split.map(parseInt).`[]`1
  tps = m.newSeqWith stdin.readLine.split.map parseInt
  stps = tps.sortedByIt it[0]
var
  pos = 0
  cnt = 0

for tp in stps:
  let
    t = tp[0]
    p = tp[1]
    a = t - cnt
    d = abs pos - p
  
  if a < d:
    echo "No"
    quit()
  
  pos = p
  cnt = t

echo "Yes"