S = list("*" + input())
ans = 0
flag = 0
num = 0
for s in S:
    if s == "*" or s == "+":
        if flag:
            ans *= int(num)
        else:
            ans += int(num)
        num = ""
        if s == "*":
            flag = 0
        else:
            flag = 1
    else:
        num += s
if flag:
    ans *= int(num)
else:
    ans += int(num)
print(ans)