Решение:

with open('9.txt', 'r') as file:
    s = file.read().splitlines()

c = 0

for i in s:
    nums = sorted(list(map(int, i.split('\t'))))
    kv = sum([nums[0] + nums[-1]]) ** 2
    if kv > nums[1] ** 2 + nums[2] ** 2 + nums[3] ** 2:
        c += 1

Ответ: 2601