Use Cylindrical coordinates to find the mass of the solid region bound above by the plane $\displaystyle z=4$, below by the paraboloid $\displaystyle z=1-x^2-y^2$ and on the side by the cylinder $\displaystyle x^2+y^2 = 1$ if the density is given by $\displaystyle \rho(x,y,z)=k *sqrt{[(x^2+y^2)]}$

How would You set up the integral, I know the density goes in the integrand, but what are the limits of integration?