import re

s = input()

op = []

for i in s:
    if i == "*" or i == "+":
        op.append(i)

t = re.split("[+*]", s)

ans = int(t[0])

for i in range(len(op)):
    if op[i] == "+":
        ans *= int(t[i+1])
    else:
        ans += int(t[i+1])

print(ans)