$ ampl hs068.mod
obj = -0.261841
MINOS 5.51: optimal solution found.
29 iterations, objective -0.9204250037
Nonlin evals: obj = 57, grad = 56, constrs = 57, Jac = 56.
x [*] :=
1 0.0678586
2 3.64621
3 0.000266135
4 0.894855
;
obj = -0.920425
Best known objective value: -0.920425026