3 ms·

The first coin’s denomination is 1, so it’d be a given that it would be shared. Two out of four isn’t much less impressive though.

• hunter2_ 3y ago
  I think you mean two out of three, given that only three are variable. The penny is fixed, as you say, lest the set size fall sharply from 99 to 19 (if there's no smaller than a 5c piece) etc. at which point optimal coinage varies anyway.
• stevage 3y ago
  Sorry yes, that was dopey of me.