mod=67280421310721
e=107
N=int(input())
L=[]
for i in range(N):
  s,x=input().split()
  x=int(x)
  L.append((s,x))
w=0
c=0
for i in range(N):
  s,x=L[i][:]
  n=len(s)
  q=pow(e,c,mod)
  c+=n*x
  c%=mod-1
  h=0
  for i in range(n):
    z=int(s[i])
    h+=z*pow(e,i,mod)
    h%=mod
  m=pow(e,(n*x)%(mod-1),mod)-1
  g=pow(e,n,mod)-1
  m*=pow(g,-1,mod)
  m%=mod
  l=m*h
  l%=mod
  l*=q
  l%=mod
  w+=l
  w%=mod
w2=0
c=0
for i in range(N-1,-1,-1):
  s,x=L[i][:]
  s=s[::-1]
  n=len(s)
  q=pow(e,c,mod)
  c+=n*x
  c%=mod-1
  h=0
  for i in range(n):
    z=int(s[i])
    h+=z*pow(e,i,mod)
    h%=mod
  m=pow(e,(n*x)%(mod-1),mod)-1
  g=pow(e,n,mod)-1
  m*=pow(g,-1,mod)
  m%=mod
  l=m*h
  l%=mod
  l*=q
  l%=mod
  w2+=l
  w2%=mod
if w==w2:
  print('Yes')
else:
  print('No')