p = """75
95 64
17 47 82
18 35 87 10
20 04 82 47 65
19 01 23 75 03 34
88 02 77 73 07 63 67
99 65 04 28 06 16 70 92
41 41 26 56 83 40 80 70 33
41 48 72 33 47 32 37 16 94 29
53 71 44 65 25 43 91 52 97 51 14
70 11 33 28 77 73 17 78 39 68 17 57
91 71 52 38 17 14 91 43 58 50 27 29 48
63 66 04 68 89 53 67 30 73 16 69 87 40 31
04 62 98 27 23 09 70 98 73 93 38 53 60 04 23"""
ps = p.split("\n")
tree = []
for x in range(0, len(ps)):
    line = []
    for y in range(0, len(ps[x].split(" "))):
        line.append(int(ps[x].split(" ")[y]))
    tree.append(line)


def traverse(t, lvl, index, val):
    if lvl < len(t):
        val = val + t[lvl][index]
        a = traverse(t, lvl + 1, index, val)
        b = traverse(t, lvl + 1, index + 1, val)
        if a < b:
            return b
        else:
            return a
    return val


print(traverse(tree, 0, 0, 0))
