use Inline C;

print "answer is ", bitlevels(), "\n";

__END__
__C__

/* begin c++ code */
/* #include<iostream> */
/* using namespace std; */

int bitlevels()
{
  unsigned int ans=0;
  int num, total, i;
  unsigned int shift;

  for(num=0;num<16777216;++num)
  {
    total=0;  
    shift=1;
    for(i=1;i<=24;++i)
    {
      if(num & shift)
      {
        total+=i;
      }
      else
      {
        total-=i;
      }
      shift<<=1;            
    }
    if(total==0) ++ans;
  }

  return ans;
}
/* end c++ code */