def flip(n): return int(''.join(reversed(str(n))))

def isLychrel(n):
	    for i in xrange(50):
	    	n1 = n + flip(n)
	    	if n1 == flip(n1): return False
	    	n = n1
	    return True

print len([n for n in xrange(10000) if isLychrel(n)])