awk '{s += $0} END {print s}'
Also
(echo 0;sed s,$,+, inputfile;echo p)|dc
or even (with gnu sed)
sed '
G
s/^ *\([0-9]*\) *\n\([0-9]*\)$/0\1pm0\2nb0/;td;d;
:d;s/n\(\(b\).*0\|\)[^0]*$/nb98765432109876543210a0123456789\2/;
s/\(.\)\(p.*\)\(.\)\(n.*\1\).*a.*\3/\2\4\3/;
s/^0*\(.*\)p\(.*m\)0*\(.*\)\(.\).\{11\}$/0\1p\4\20\3/;
/m0*n.*0/!bd;
s/^\(.*\)p\(.*\)m.*/\1\2/;s/^0*//;
h;$!d
' inputfile
but the point of the OP was to improve his Perl skills.
Update 2007 dec 6: see also Re: Golf: Adding up array elements
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