S = raw_input()

def calc(ans, temp, next):
    if next == "+":
        ans += int(temp)
    elif next == "*":
        ans *= int(temp)
    return ans

ans = 0
temp = ""
next = "+"

for s in S:
    if s != "*" and s != "+":
        temp += s
        
    elif s == "*": 
        ans = calc(ans, temp, next)
        temp = ""
        next = "+"
        
    elif s == "+":
        ans = calc(ans, temp, next)
        temp = ""
        next = "*"
        
ans = calc(ans, temp, next)

print ans