"""
Calculate the number of assignment pairs, where
one range fully contains the other.
"""

contained = 0

with open("4.in") as fh:
    for line in fh:
        line = line.strip()

        elves = []
        for elf in line.split(","):
            elf_s, elf_e = [int(x) for x in elf.split("-")]
            elves.append({
                "start": elf_s,
                "end": elf_e
            })

        elf0_contains_elf1 = (
            elves[0]["start"] <= elves[1]["start"]
            and elves[0]["end"] >= elves[1]["end"]
        )
        elf1_contains_elf0 = (
            elves[1]["start"] <= elves[0]["start"]
            and elves[1]["end"] >= elves[0]["end"]
        )

        if elf0_contains_elf1 or elf1_contains_elf0:
            contained += 1

print(contained)