s=input()+'+'
now=0
ans=0
plus=True
for i in range(len(s)):
    if s[i].isdecimal():
        now=now*10+int(s[i])
    else:
        if plus:
            ans+=now
            now=0
            if s[i]=='+':
                plus=False
        else:
            ans*=now
            now=0
            if s[i]=='*':
                plus=True
print(ans)