An MC simulation at constant NVT is used to generate configurations for a LJ fluid with shifted potential at 3.0σ cutoff. FMAP-enabled insertion is used to obtain the excess chemical potential. The propgram will take about 2 to 12 minutes with default parameters, for N from 30 to 450, on i7-4770S CPU @ 3.10GHz. You could always check the progress from Console. (Finding Your Browser's Developer Console)
Number Density Excess Chemical Potential (kT) 00