i don't think that there is any formula you can use to calculate the "total" based on the "row numbers". the result is called "de-dublicated" but in fact it is a calculation on the raw data.
just an example: assume you have 3 pages and you registered a total of 3 visits. but have a look at the following cases:
a) each visit just visited 1 page, the table looks like
page 1: 1 visit
page 2: 1 visit
page 3: 1 visit
b) each visit visited all 3 pages, now your table
page 1: 3 visits
page 2: 3 visits
page 3: 3 visits
both cases sum up with a total of 3 visits. without nowing the raw data you do not have any chance to calculate the (de-dublicated) total.
your only chance is having a look at raw data and make the calculation yourself. read here about identifying unique visitors, visits is somewhere nearby: Identifying Visitors