import re

s = input()

nums = []
ope = []

nums = re.findall(r"\d+", s)

for i in s:
    if(i in ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]):
        continue
    else:
        ope.append(i)

ans = int(nums[0])

for i, o in enumerate(ope):
    if o == "*":
        ans += int(nums[i + 1])
    elif o == "+":
        ans *= int(nums[i + 1])
        
print(ans)