s = raw_input()
l = []
p = 0
q = 0
while p < len(s):
    while q < len(s) and s[q] != '*' and s[q] != '+':
        q += 1
    l.append(int(s[p:q]))
    if q < len(s):
        l.append(s[q])
    q += 1
    p = q
n = l[0]
for i in range(1,len(l),2):
    if l[i] == '*':
        n += l[i+1]
    else:
        n *= l[i+1]
print n