S=input()
tmp=""
save=[]
ans=0
for i in S:
    if i=="*" or i=="+":
        save.append(int(tmp))
        save.append(i)
        tmp=""
    else:
        tmp+=i
if tmp!="":
    save.append(int(tmp))
ans=save[0]
for i in range(1,len(save),2):
    sign,nu=save[i],save[i+1]
    if sign=="*":
        ans+=nu
    else:
        ans*=nu
print(ans)