import re
s = input()
s = s.replace('*','a')
s = s.replace('+','*')
s = s.replace('a','+')
reg1 = r'[0-9]+'
reg2 = r'[+*]'

nums = re.findall(reg1,s)
ops = re.findall(reg2,s)
for i in range(len(ops)) :
    if i == 0 :
        w = nums[i]
    x = str(w) + ops[i] + nums[i+1]
    w = eval(x)
print(w)