analyze a column, get the adjacent integer and sum it up as a total

What I would like to do is the following:

if for e.g. i have the following statistics:

46 23
12 26
102 31
1 27
33 25
34 21
55 33
20 23
29 27
34 28

and I stated before for example if I choose the number 33, then I know that the numbers greater or equal to 33 (in the 1st column) are the 46, 102, 33, 34, 55 and 34 and it appears 6 times.

Is it possible to choose automatically their respective adjacent number (2nd column) such as 23 (for 46), 31 (for 102), 25 (for 33), 21 (for 34) and add them up as a total?

Thanks!