# coding: utf-8

inpt = input()

isPlus = True
subTotal = 0
prevIdx = 0
for i in range(0, len(inpt)):
    if (inpt[i] == '*' or inpt[i] == '+'):
        num = int(inpt[prevIdx:i])
        if(isPlus):
            subTotal += num
        else:
            subTotal *= num
        prevIdx = i + 1
        isPlus = inpt[i] == '*'

if(isPlus):
    subTotal += int(inpt[prevIdx:])
else:
    subTotal *= int(inpt[prevIdx:])

print(subTotal)