S = input()

def parse(S):
    operators = set(['*', '+'])
    nums = []
    ops = []
    tmp = 0
    for s in S:
        if s in operators:
            nums.append(tmp)
            tmp = 0
            ops.append(s)
        else:
            tmp *= 10
            tmp += int(s)
    nums.append(tmp)
    return nums, ops

def calc(S):
    nums, ops = parse(S)
    if len(ops) == 0:
        return nums[0]
    val = nums[0]
    for op, arg in zip(ops, nums[1:]):
        if op == '+':
            val *= arg
        elif op == '*':
            val += arg
        else:
            raise RuntimeError('Unknown operator!' + op)
    return val

print(calc(S))