Y add -20.8 sub mul 38.6 mul div x_3 x_4 div div x_3 mul x_1 x_2 exp add 83.2 mul 0.47300000000000003 x_3 sub mul 24.700000000000003 pow3 add 0.633 mul -0.5700000000000001 x_4 mul 5.43 log add 2.83 mul 0.926 x_0