I found this one in a cheap Russian pocket book. Because of the cyrillic letters I Can't tell the author's name. But it's quite nice anyway.

Here it is.

By the way the four volumes of this series are very nice for the beach or the bathtub because most of the problems are very easy but fun to solve.

Nice one, I'm surprised I got it straight off as well, no mitakes. (Damn spoke too soon, see what I did there! Comedy gold)

Thank You.