Just found a solution for it! I just said it to listen to keys being pressed using "OR ||". Example code:
if (d1 == 1 || GetAsyncKeyState(0x31) & 0x8000 || GetAsyncKeyState(0x61) & 0x8000)
{
select = 1;
break;
}
0x31 refers to the key address of button "1" and 0x61 is numpad 1.