UNIX for Dummies Questions & Answers

I have a file that has dates like this:
date FINAL_RESULT; 7
date FINAL_RESULT; 2
date FINAL_RESULT; 5

With this command: seira=`cut -f2 -d\; tes.txt` i take the date FINAL RESULTs and i store them on variable seira.then seira look like this: 6 3 8
I want to read seira and make a sum of all results 7+2+5 etc. i don't know how many records there are in the file. So i want to read seira with the next loop using while but it doesn 't work. i don't want to use grep or awk. I want to use while and cut but it is wrong. Can someone help me please

while [ "$seira" != "" -a "$seira" != " " ]
do
sum=0
pros1=`cut -f1 -d \ $seira`
pros2=`cut -f2 -d \" " $seira`
sum=`expr $sum+$pros1`
seira=$pros2
done

Can someone correct it? I have a big problem and i am in a big need.PLZ!