a = 0
st1 = []
st2 = []
for i in input()+"+":
    if i=="*":
        st1.append(a)
        a = 0
        st2.append(0)
    elif i=="+":
        st1.append(a)
        a = 0
        st2.append(1)
    else:
        a = a*10+int(i)

ans = st1[0]
for i,s in zip(st1[1:],st2):
    if s: ans*=i
    else: ans+=i
print(ans)