Integer points (-3, -2,-1, 0, 1, 2, 3) at a certain distance from the origin of the number axis, * * 7 points.

Integer score is not more than 4 (-4, -3, -2,-1, 0, 1, 2,3,4) * * * 9 points.

Integer points are equal to 4 (-4,4) 2 points.

One *** 18.

∴x=7 y=9 z=2

x+y+z= 18