'Use keypad on the DWM

I would like to use my Keypad keys on my DWM (Suckless). I know I need to

#include <X11/XF86keysym.h>

but what are the correct keys to use? If I want to use the numbers(on my keypad) 1,2,3 and 4 to swtich tags how should I specify this in the DWM ?

TAGKEYS(                        XK_KP_1,                           0)
TAGKEYS(                        XK_KP_2,                           1)
TAGKEYS(                        XK_KP_3,                           2)
TAGKEYS(                        XK_KP_4,                           3)
TAGKEYS(                        XK_KP_5,                           4)
TAGKEYS(                        XK_KP_6,                           5)
//
TAGKEYS(                        XK_1,                              0)
TAGKEYS(                        XK_2,                              1)
TAGKEYS(                        XK_3,                              2)
TAGKEYS(                        XK_4,                              3)
TAGKEYS(                        XK_5,                              4)
TAGKEYS(                        XK_6,                              5)

As you can see I tried the command XK_KP_1 (I found it on this website) but it didn't work



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