How to read the result of outputfile

[xzy789]

When I use “dmesg|tail” to get the result of bandwidth, the result includes 10 numbers.
such as:
1 640(36)
2 640(36)
3 640(36)
4 640(36)
5 640(36)
6 640(36)
7 640(36)
8 640(36)
9 640(36)
10 640(36)
Should I Accumulate these data to get the final answer(6400=640*10)?
Hope to get your answer.
Ziyue, Xu
Nankai university