04. Battle Ships

rows = int(input())
ships = []
counter = 0

for i in range(rows):
    current_list = [int(el) for el in input().split()]
    ships.append(current_list)

command = [el for el in input().split()]

for x in range(len(command)):
    if ships[int(command[x][0])][int(command[x][2])] != 0:
        ships[int(command[x][0])][int(command[x][2])] -= 1
        if ships[int(command[x][0])][int(command[x][2])] == 0:
            counter += 1

print(counter)