import sys

# The spreadsheet consists of rows of apparently-random numbers.
# To make sure the recovery process is on the right track, they need
# you to calculate the spreadsheet's checksum. For each row, determine
# the difference between the largest value and the smallest value; the
# checksum is the sum of all of these differences.
#
# For example, given the following spreadsheet:
#
# 5 1 9 5
# 7 5 3
# 2 4 6 8
#
# The 1st row's max and min values are 9 and 1, and the difference is 8.
# The second row's max and min values are 7 and 3, and their difference is 4.
# The third row's difference is 6.
# In this example, the spreadsheet's checksum would be 8 + 4 + 6 = 18.


def min_max(inp):
    arr = [int(num) for num in inp.split()]
    return max(arr) - min(arr)


if __name__ == "__main__":
    ret = 0
    with open(sys.argv[1]) as data:
        for line in data:
            ret += min_max(line)

    print(ret)