import numpy as np
import fileinput

if __name__ == '__main__':
    inpt = fileinput.input()
    n = int(next(inpt))
    inpt = next(inpt)

    op = '+'
    inpt = list(" " + inpt + " ")
    for i, c in list(enumerate(inpt))[1:-1]:
        if c == ' ' and not inpt[i - 1] == '(' and not inpt[i + 1] == ')':
            inpt[i] = op
        if c == '(' or c == ')':
            op = '*' if op == '+' else '+'

    # print("".join(inpt[:-1]))
    print(eval("".join(inpt[:-1])))