Keywords of the C-language

Table 1. There are 32 keywords

unsignedcontinuetypedefvolatile
constbreakdefaultdo
doubleelseenumextern
floatforgotoif
intlongregisterreturn
shortsignedsizeofstatic
structswitchcaseunion
autovoidcharwhile

The philosophy behind was to keep the language clear and simple. How many keywords and API calls do you really use/understand? The windows system call interface e.g. has more than 600 functions!!!