S=input()
op=[]
for i in S:
    if i in ["+","*"]:
        op.append(i)
S=list(map(int,S.replace("+"," ").replace("*"," ").split()))
ans=S.pop(0)
for o in op:
    if o=="+":
        ans*=S.pop(0)
    else:
        ans+=S.pop(0)
print(ans)