with open("input") as f:
    puzzle_input = [n.strip() for n in f.readlines()]

ribbon = 0

for present_dim in puzzle_input:
    parsed_dim = [int(x) for x in present_dim.split("x")]
    parsed_dim.sort()

    [l, w, h] = parsed_dim

    ribbon += 2 * l + 2 * w + l * w * h

print(ribbon)