import sys

def processline(l):
    # a x b x c
    (a,b,c) = tuple(map(int,l.split('x')))
    print(l, a,b,c)
    s1 = a * b
    s2 = a * c
    s3 = b * c
    slack = min(s1,s2,s3)
    return 2*(s1+s2+s3)+slack

R = 0
for l in sys.stdin.readlines():
    n = processline(l[:-1])
    R += n
print(R)