import re

S = re.findall(r'\+|\*|\d+', raw_input().strip())
L = len(S)
acc = int(S[0])
i = 1
while i < L:
    if S[i] == '*':
        acc = acc + int(S[i+1])
        i += 2
    elif S[i] == '+':
        acc = acc * int(S[i+1])
        i += 2
    else:
        raise 'Invalid input'
print(acc)