f = open("./data.txt", "r")
elfTotal = 0
mostestElf = 0
nextMostestElf = 0
leastMostestElf = 0
for x in f:
    try:
        elfTotal += int(x)
    except:
        if elfTotal > mostestElf:
            leastMostestElf = nextMostestElf
            nextMostestElf = mostestElf
            mostestElf = elfTotal
        elif elfTotal > nextMostestElf:
            leastMostestElf = nextMostestElf
            nextMostestElf = elfTotal
        elif elfTotal > leastMostestElf:
            leastMostestElf = elfTotal
        elfTotal = 0
print(mostestElf + nextMostestElf + leastMostestElf)