s = input()
num = list(s)
opelist = []

for i in range(len(s)):
    if s[i] in [ "+", "*" ]:
        num[i] = " "
    
    if s[i] in [ "+" ]:
        opelist.append('*')
    elif s[i] in [ "*" ]:
        opelist.append('+')

numlist = "".join(num).split(" ")

for i in range(len(opelist)):
    cal = numlist[i] + opelist[i] + numlist[i+1]
    numlist[i+1] = str(eval(cal))

print(numlist[-1])