import sys


def input(): return sys.stdin.readline().rstrip()


def main():
    p = 0
    op = '*'
    q = 0

    def calc(a, b, c):
        return b+c if a == '*' else b*c

    for i in input():
        if i in '*+':
            p, op, q = calc(op, p, q), i, 0
        else:
            q = 10*q+int(i)

    print(calc(op, p, q))


if __name__ == '__main__':
    main()