#define COUNT 2000

can any one give me the meaning of following line

#define COUNT  2000
#define KEY2    0x2F
#define KEY1    0xF8

COUNT,KEY2,KEY1 are the name's given which we going to use next in the prog. but what is 2000,0x2F,0xF8 is address i.e memory location or simply just value.

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