perl -Mstrict -e '
my $i = 0;  

print ++$i + 1,"\n"; 
print $i++ + 1,"\n";     
print $i + $i++,"\n";  
print ++$i + ++$i,"\n"; 
print ++$i + $i++ + 1,"\n";
'
2
2
5
10
14