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There's a fair bit of extra material though. So for example on wall 1 and 2 you could split the spare edge pieces (that don't cover any part of the wall) to between both walls, which saves 5 squares. However, it depends on whether or not they match up in the corners properly.
Wall 3 has a massive amount of spare material as well.
frankenbike
Ok, so I had a bit of a play with this, I figured, to get matching wall paper we could split it into blocks of 0.53m x 0.53m giving you just under 19 blocks per strip of wallpaper.
I mocked it up on autocad, overlaying the number of blocks you would need to cover each wall section and came up with 85, this doesn't take into account using left over strips to start a new wall so should really be worst case scenario.
Divide 85 by 19 = 4.5 rolls so 5 should definitely do you.