lines = open("input.txt", "r").read().splitlines()
contains = 0
for line in lines:
    lots = [int(i) for i in line.replace(",", "-").split("-")]
    if (lots[0] >= lots[2]) and (lots[1] <= lots[3]):
        contains = contains + 1
    elif lots[0] <= lots[2] and lots[1] >= lots[3]:
        contains = contains + 1
print(contains)