s = input()

n = len(s)
ans = None
op = None
i = 0
a = ''
while i < n:
    if s[i].isdigit():
        a += s[i]
    else:
        if ans is None:
            ans = int(a)
        else:
            if op == '*':
                ans += int(a)
            else:
                ans *= int(a)
        a = ''
        op = s[i]
    i += 1
if op == '*':
    ans += int(a)
else:
    ans *= int(a)
print(ans)