local lines <const> = {
    "                 55",
    "                94 48",
    "               95 30 96",
    "              77 71 26 67",
    "             97 13 76 38 45",
    "            07 36 79 16 37 68",
    "           48 07 09 18 70 26 06",
    "          18 72 79 46 59 79 29 90",
    "         20 76 87 11 32 07 07 49 18",
    "        27 83 58 35 71 11 25 57 29 85",
    "       14 64 36 96 27 11 58 56 92 18 55",
    "      02 90 03 60 48 49 41 46 33 36 47 23",
    "     92 50 48 02 36 59 42 79 72 20 82 77 42",
    "    56 78 38 80 39 75 02 71 66 66 01 03 55 72",
    "   44 25 67 84 71 67 11 61 40 57 58 89 40 56 36",
    "  85 32 25 85 57 48 84 35 47 62 17 01 01 99 89 52",
    " 06 71 28 75 94 48 37 10 23 51 06 48 53 18 74 98 15",
    "27 02 92 23 08 71 76 84 15 52 92 63 81 10 44 10 69 93"
}

local f = lines:back():split(" ")
local d = f:map(|s| -> tonumber(s))
for row = #lines - 1, 1, -1 do
    local l = d[1]
    local i = 1
    for lines[row]:lstrip():split(" ") as s do
        local u = tonumber(s)
        local r = d[i + 1]
        d[i] = (l > r) ? u + l : u + r
        l = r
        i += 1
    end
end
print(d[1])