def run():

    src = open("src.txt", "r")
    tri = []

    for i in range(15):

        line = src.readline()
        line = line[:-1].split(" ")
        tri.insert(0, line)

    tri = [[int(a) for a in b] for b in tri]

    while len(tri) > 1:

        for i in range(len(tri[1])):

            tri[1][i] += max(tri[0][i], tri[0][i + 1])

        del tri[0]

    return tri[0]


print run()