elves = []
count = 0
with open("input.txt", "r") as f:
    for line in f.readlines():
        line = line.strip("\n")
        # Some python magic to split out the strings and convert them to integers
        pair = [x.split("-") for x in line.split(",")]
        pair = [[int(y) for y in x] for x in pair]
        elves.append(pair)
        # Elves is now a list of list of lists.
    for elf in elves:
        if ((elf[0][0] <= elf[1][0] and elf[0][1] >= elf[1][1]) or 
            (elf[1][0] <= elf[0][0] and elf[1][1] >= elf[0][1])):
            print(elf)
            count += 1
print(count)