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

overlaps = 0

def compare(elf0, elf1):
    return elf1["start"] <= elf0["start"] <= elf1["end"]


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_overlaps = compare(elves[0], elves[1])
        elf1_overlaps = compare(elves[1], elves[0])

        if elf0_overlaps or elf1_overlaps:
            overlaps += 1

print(overlaps)