s = input()

a = []
for i in s:
    if i in '+*':
        a += i

b = s.split('+')
c = []
for i in b:
    c += map(int,i.split('*'))

d = c.pop(0)
for i in range(len(a)):
    if a[i] == '*':
        d = d + c[i]
    else:
        d = d * c[i]

print(d)