S = raw_input()
res = 0
tmp = 0
plus = False
mult = False
for x in range(len(S)):
    if (S[x] == '*'):

        if (plus):
            res += tmp
        elif (mult):
            res *= tmp
        else:
            res = tmp
        plus = mult = False
        plus = True
        tmp = 0
    elif (S[x] == '+'):

        if (plus):
            res += tmp
        elif (mult):
            res *= tmp
        else:
            res = tmp
        plus = mult = False
        mult = True
        tmp = 0
    else:
        tmp = 10 * tmp + int(S[x])
        
if (plus):
    res += tmp
elif (mult):
    res *= tmp
else:
    res = tmp

print res