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import fileinput
from functools import reduce
from operator import mul
with fileinput.input() as lines:
all = list(lines)
a = [line[:-1] for line in all[:-1]]
op = all[-1][:-1]
def sol(a, j, k):
nums = []
i = k-2
while i >= j:
n = 0
for r in a:
if r[i] != ' ':
n = 10*n + int(r[i])
nums.append(n)
i -= 1
return sum(nums) if op[j] == '+' else reduce(mul, nums, 1)
j = 0
s = 0
while j < len(op):
k = j+1
while k < len(op) and op[k] == ' ':
k += 1
if k >= len(op):
k = max(len(r) for r in a)+1
s += sol(a, j, k)
j = k
print(s)
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