## 300. Math Puzzle $5 / 90$

Today, you'll have to measure your cleverness against a sky-high "technikus" tower. The magazine has existed since 1963, and if the parents have already browsed through it to delve into the secrets of modern natural sciences and technology or to get smart tips, then a considerable collection lies before them, which, when stacked, is simply impossible to overlook.

But now we want to know what stack height a tower made of all the issues of the magazine published so far, including issue 5/9, would reach.

As a basis for calculation, we also provide that a "technikus" is two millimeters thick and that, on average, 110,000 copies have been distributed to readers every month since issue 1/63. Heaven ... and thread, well, that's going to be high!
From January 1963 to December 1989, $27 \cdot 12=324$ issues were published, so up to issue 5/1990, a total of 329 issues were published with a total circulation of 3619000 copies.

The stack has a height of $72380000 \mathrm{~mm}=72380 \mathrm{~m}=72.38$ kilometers.

After issue 5/1990, the magazine was discontinued.