d = list(map(int, input().split(",")))
n = len(d)
startA = 0
endA = n
startB = 0
endB = 0
w = 0
while __________:
    t = 0
    for i in range(__________):
        if startA != endA:
            if startB != endB:
                if d[startA] < d[startB]:
                    t = t + d[startA]
                    startA += 1
                else:
                    t = t + d[startB]
                    startB += 1
            else:
                t = t + d[startA]
                startA += 1
        else:
            t = t + d[startB]
            startB += 1
    w += t
    __________
    endB += 1
print(w)