lines = open("input.txt", 'r').read().splitlines()
leng = len(lines)
bits = len(lines[0])

def fun(bol):
	targetCandidates = list(range(0,leng))
	rating = 0
	target = True
	for i in range(0, bits):
		count = 0
		vacate = []
		for j in targetCandidates:
			if len(targetCandidates) == 1:
				o2 = int(lines[j], 2)
				break
			elif i != 0 and bool(int(lines[j][i-1])) != target :
				vacate.append(j)
			elif bool(int(lines[j][i])):
				count += 1
		targetCandidates = [i for i in targetCandidates if i not in vacate]
		if count >= len(targetCandidates)/2 and bol:
			target = True
		elif count < len(targetCandidates)/2 and not bol:
			target = True
		else:
			target = False
		if len(targetCandidates) == 2:
			if bool(int(lines[targetCandidates[0]][i])) == target:
				return int(lines[targetCandidates[0]], 2)
			else:
				return int(lines[targetCandidates[1]], 2)
		elif len(targetCandidates) == 1:
			return  int(lines[targetCandidates[0]], 2)
	
				
print(fun(True)*fun(False))