"""
1+2+3
6

2+2*2
8

4+5*5+4
81


4+5*5+4

"""

expr_str = input()
n = len(expr_str)


def calc(a, b, op):
    if op == "+":
        return a + b
    elif op == "*":
        return a * b
    else:
        raise Exception("unknown op")


def arifm(expr):
    MAX_VAL = 10000000
    MIN_VAL = -MAX_VAL
    m = (len(expr) + 1) // 2
    max_arr = []
    min_arr = []

    for i in range(0, m):
        max_arr.append([0] * m)
        min_arr.append([0] * m)
        max_arr[i][i] = int(expr[2 * i])
        min_arr[i][i] = int(expr[2 * i])

    for s in range(0, m - 1):
        for i in range(0, m - s - 1):
            j = i + s + 1
            min_val = MAX_VAL
            max_val = MIN_VAL

            for k in range(i, j):
                a = calc(min_arr[i][k], min_arr[k + 1][j], expr[2 * k + 1])
                b = calc(min_arr[i][k], max_arr[k + 1][j], expr[2 * k + 1])
                c = calc(max_arr[i][k], min_arr[k + 1][j], expr[2 * k + 1])
                d = calc(max_arr[i][k], max_arr[k + 1][j], expr[2 * k + 1])
                min_val = min(min_val, min(a, min(b, min(c, d))))
                max_val = max(max_val, max(a, max(b, max(c, d))))

            min_arr[i][j] = min_val
            max_arr[i][j] = max_val

    return max_arr[0][m - 1]


print(arifm(expr_str))