Using awk to sum the values of a column, based on the values of another column

I am trying to sum certain numbers in a column using awk. I would like to sum just column 3 of the "smiths" to get a total of 212. I can sum the whole column using awk but not just the "smiths". I have: awk 'BEGIN {FS = "|"} ; {sum+=$3} END {print sum}' filename.txt Also I am using putty. Thank you for any help. smiths|Login|2 olivert|Login|10 denniss|Payroll|100 smiths|Time|200 smiths|Logout|10