A dam has a vertical cross-section in the shape of a parabola $y = x^2$ for $0 \\le x \\le 2$ meters (width $w$ is constant at 10 meters). The water depth is $d = 4$ meters. The hydrostatic force on the dam wall is given by $F = \\int_0^d \\rho g (d - y) w ds$, where $ds = \\sqrt{1 + (dx/dy)^2} dy$. Which integral represents the total hydrostatic force?