Something like "17 different values of mass"[1][2][3][4][5][6][7] is a good simple model, if you allow me to put enough footnotes at the end. Different particles have different mass, and we can use the mass to classify them and call it a day and so we get 17.

[1] Actually the photons and the gluons have mass=0, but nobody would confuse them. So, let's count them as different particles. (If it exist, the graviton also has mass=0 too.)

[2] There is something weird with the W and Z particles, Hardcore particle physicist may claim they are the same particle and give a two hour talk about the apparent difference of mass.

[3] There is something weird with the mass of neutrinos. Don't ask unless you really love linear algebra.

[4] There may be details that I'm hiding on purpouse.

[5] There are details that I forgot. I studied this a long time ago.

[6] There are details that I never learned, perhaps more than what I expect.

[7] Unknown unknowns.