class Pair(object): 
	def __init__(self, a, b): 
		self.a = a 
		self.b = b 
def max_chain_length(arr, n): 
	max = 0
	mcl = [1 for i in range(n)] 
	for i in range(1, n): 
		for j in range(0, i): 
			if (arr[i].a > arr[j].b and
				mcl[i] < mcl[j] + 1): 
				mcl[i] = mcl[j] + 1
	for i in range(n): 
		if (max < mcl[i]): 
			max = mcl[i] 
	return max