s=input()
ind=0
t=''
ans=0

for i in range(len(s)):
    if ans == 0:
        if s[i] == '+' or s[i] == '*':
            ans = int(s[:i])
            ind=i+1
            t=s[i]

    elif s[i] == '+' or s[i] == '*':
        if t == '+':
            ans *= int(s[ind:i])
            ind=i+1
            t = s[i] 
        elif t == '*':
            ans += int(s[ind:i])
            ind=i+1
            t = s[i]

if t == '+':
    ans *= int(s[ind:]) 
else:
    ans += int(s[ind:])
    
print(ans)