import re

S = input()
d = re.split(r"[+*]", S)
d = list(map(int, d))
ope = re.split(r"[0-9]+", S)[1:-1]

ans = d[0]
for i in range(len(ope)):
    if ope[i] == '*':
        ans += d[i + 1]
    elif ope[i] == '+':
        ans *= d[i + 1]
print(ans)