######################################################################
##  author: John Jiang
##  How to use:
##  Run the script in the same location as the file "results.txt"
##  Place your results inside the file in the following format:
##  Course Code Credit Mark
##  e.g.
##  COMP 1337 6 100
##  DOTA 1001 6 87
##  etc...
######################################################################
file = open("results.txt", 'rU')
total_mark = 0
total_weight = 0
for line in file:
    words = line.split()
    weight = int(words[1][0]) * int(words[2])
    mark = float(words[3])
    total_mark += mark * weight
    total_weight += weight

print "Wam:", total_mark/total_weight