import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

S = read().rstrip().decode()

words = S.replace('*',' * ').replace('+', ' + ').split()

nums = map(int, words[::2])
ops = words[1::2]

x = next(nums)
for op, y in zip(ops, nums):
    if op == '*':
        x += y
    else:
        x *= y

print(x)