The least amount of suffering for whom?I'd define good as that which causes the least amount of suffering. I'd say humans are basically good, and this is a result of bio & socio evolution.
If a mother sacrifices her life to save her child, the child does not suffer - except of course for the loss of its mother - but the mother suffers greatly. So in this case that which was good actually caused a great deal of suffering. Of course, you could argue the mother may have suffered more if she did not sacrifice her life and that may be correct. Which leads us to the root cause of good... selflessness. That which is good is selfless.
Otherwise we get into competing suffering which leads to the rule of capture which we all know is not good.