s = input()
ans = [s[0]]
for i in range(1, len(s)):
    if s[i] == "*":
        ans.append("*")
        ans.append("")
    elif s[i] == "+":
        ans.append("+")
        ans.append("")
    else:
        ans[-1] += s[i]

tmp = int(ans[0])
for i in range(1, len(ans), 2):
    if ans[i] == "+":
        tmp *= int(ans[i+1])
    else:
        tmp += int(ans[i+1])
print(tmp)