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#include <iostream.h>

long *arr;
int n;

void load()
{
 int i;
 int l;
 char c;
 cin >> n;
 arr = new long[n];
 for (i=0; i<n; i++)
 {
  while (cin.get(c) && c!=' ');
  cin >> l;
  if (l==1)
   cin >> arr[i];
  else
   arr[i]=0;
 }
}

void check()
{
 long l=0, i;
 int cheat=0;
 for (i=n-1; i>=0 && !cheat; i--)
 {
  if (arr[i])
  {
   if (l>arr[i]) cheat=1;
   l=arr[i]+1;
  }
  else
   arr[i]=l++;
 }
 if (!cheat)
 {
  l=0;
  for (i=0; i<n; i++)
   l+=arr[i];
  if (l>10000)
   cheat=1;
 }
 if (!cheat)
  cout << "YES";
 else
  cout << "NO";
}

int main()
{
 load();
 check();
 return 0;
}

It's recommended that you discuss problems at
http://www.ioiforum.org/en/
A lot of excellent students (e.g.
http://acm.timus.ru/author.asp?id=12163 )
are from the forum.

You can register a username at
http://www.ioiforum.org/en/userreg.asp

Try to discuss problems there, you will have fun of solving probelms!