import re
S = input()
s = re.split('[*+]', S)
res = int(s[0])
cnt = 0
for i in range(len(S)):
    if S[i] == '+':
        res *= int(s[cnt+1])
        cnt += 1
    elif S[i] == '*':
        res += int(s[cnt+1])
        cnt += 1
print(res)