YES

1 decompositions
 #0 -----------
   1: +(0(),y) -> y
   2: +(s(x),y) -> s(+(x,y))
   3: inc(x) -> s(x)
   4: +(x,y) -> +(y,x)
   5: inc(+(x,y)) -> +(inc(x),y)

@Jouannaud and Kirchner's criterion
--- R
   1: +(0(),y) -> y
   2: +(s(x),y) -> s(+(x,y))
   3: inc(x) -> s(x)
   4: +(x,y) -> +(y,x)
   5: inc(+(x,y)) -> +(inc(x),y)

--- S
   1: +(0(),y) -> y
   2: +(s(x),y) -> s(+(x,y))
   3: inc(x) -> s(x)
   4: +(x,y) -> +(y,x)
   5: inc(+(x,y)) -> +(inc(x),y)