The last print statement is only reached when C is not the biggest number and they are not all equal. If you put the last print outside of the else clause it will get executed more often

PS: Check out what gets printed if A and B are some random but different numbers and C==0

PPS: You should always have a line 'use warnings;' in your code (right after '#!/usr/bin/perl'). It helps you with finding bugs (not this one though).