You cant count them.
Actually you can count them by doing a bit of research. Cannabis is a genus of the taxonomical kingdom Plantae and includes a large number of plant species. If you are a pothead, however, you will be interested in only two species, Cannabis sativa and Cannabis indica, from which the "countless" types of pot are derived.
Unfortunately, these "types" of pot are only "countless" to hardcore potheads who, for the most part, have lost their ability to count, or had no such ability in the first place.
All the smokeable products revered by marijuana users are derived from various parts of these two plants using various processes. Often the products are mixed with other inocuous substances such as kitchen herbs, paraffin wax or cowshit (because it smells and looks like hashish), or are spiked with more addicting substances such as amphetamines in an effort to "hook" the user and keep them buying.
If you still feel you cannot count the "types" of cannabis (1,2), and especially if you cannot spell the word, you might consider seeking help.
Marijana Micic is 167 cm.
Marijana Marković was born in 1982.
Marijana Šurković was born on 1984-02-14.
Marijana Mićić was born on 1983-03-20.
Marijana Matthäus was born on 1971-09-27.
Marijana Rajcic was born on 1989-03-15.
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Marijana Batinic was born on February 18, 1981, in Split, Croatia.
Marijana Mikulic was born on December 6, 1981, in Mostar, Bosnia and Herzegovina.
Marijana Petrovic was born on March 5, 1957, in Belgrade, Serbia, Yugoslavia.
Marijana Micic was born on March 20, 1983, in Belgrade, Serbia, Yugoslavia.
Marijana Brecelj was born on June 8, 1946, in Ljubljana, Yugoslavia (now Slovenia).