YES
O(n^2)
TRS:
 {
  app(app(plus(), app(s(), x)), y) -> app(s(), app(app(plus(), x), y)),
                      app(id(), x) -> x,
                  app(plus(), 0()) -> id()
 }
 Natural interpretation:
  Strict:
   {
    app(app(plus(), app(s(), x)), y) -> app(s(), app(app(plus(), x), y)),
                        app(id(), x) -> x,
                    app(plus(), 0()) -> id()
   }
  Weak:
   {}
  Interpretation class: deltarestricted
  [s](delta) = + 1 + 0*delta
  [0](delta) = + 0 + 0*delta
  [plus](delta) = + 1 + 0*delta
  [id](delta) = + 1 + 0*delta
  [app](delta, X1, X0) = + 1*X0 + 1*X1 + 0 + 0*X0*delta + 1*X1*delta + 0*delta
  
  
  
  
  app_tau_1(delta) = delta/(1 + 1 * delta)app_tau_2(delta) = delta/(1 + 0 * delta)
  
  Qed