Week1 = []
Week2 = []

for i in range(7):
    Week1.append(str(input()))

for k in range(7):
    Week2.append(str(input()))

CircleNumOfWeek1 = Week1.count("〇")
CircleNumOfWeek2 = Week2.count("〇")

if(CircleNumOfWeek1 >= CircleNumOfWeek2):
    print(CircleNumOfWeek1)
elif(CircleNumOfWeek2 >= CircleNumOfWeek1):
    print(CircleNumOfWeek2)
else:
    print(CircleNumOfWeek1)