S = input()
T = S.replace("*", ",*,").replace("+", ",+,")
S2 = T.split(",")

ans = int(S2[0])

for i in range(1, len(S2)):
    if S2[i] == "*":
        ans += int(S2[i + 1])
    elif S2[i] == "+":
        ans *= int(S2[i + 1])

print(ans)