D ={ i:0 for i in range(9) }
for l in list(map(int,__import__("sys").stdin.read().split(","))):
	D[l]+=1
for i in range(256):
	D = { i-1:D[i] for i in range(9) }
	D[6] += D[-1]
	D[8] = D[-1]
	del D[-1]
print(sum(D.values()))