sundries

 1from fractions import Fraction
 2import sys
 3
 4total = 0
 5
 6for line in sys.stdin:
 7    fields = line.split(" ")
 8    prod = 1
 9    for field in fields:
10        field = field.strip()
11        if field == "":
12            continue
13        frac = field.split("/")
14        num = int(frac[0].strip())
15        denom = int(frac[1].strip())
16        prod *= Fraction(num, denom)
17
18    total = total + prod
19
20print(total)