def evaluate_expression(s):
    def parse_nonzero_digit(s, index):
        return int(s[index]), index + 1

    def parse_digit(s, index):
        if s[index] == '0':
            return 0, index + 1
        else:
            return parse_nonzero_digit(s, index)

    def parse_positive_number(s, index):
        if s[index] == '0':
            return parse_digit(s, index)
        else:
            value, next_index = parse_nonzero_digit(s, index)
            while next_index < len(s) and s[next_index].isdigit():
                digit, next_index = parse_digit(s, next_index)
                value = value * 10 + digit
            return value, next_index

    def parse_number(s, index):
        if s[index] == '-':
            value, next_index = parse_number(s, index + 1)
            return -value, next_index
        elif s[index].isdigit():
            return parse_positive_number(s, index)
        else:
            raise ValueError("Invalid number format")

    def parse_factor(s, index):
        if s[index] == '(':
            value, next_index = parse_expression(s, index + 1)
            if s[next_index] == ')':
                return value, next_index + 1
            else:
                raise ValueError("Mismatched parentheses")
        else:
            return parse_number(s, index)

    def parse_term(s, index):
        left, next_index = parse_factor(s, index)
        while next_index < len(s) and (s[next_index] == '*' or s[next_index] == '/'):
            operator = s[next_index]
            right, next_index = parse_factor(s, next_index + 1)
            if operator == '*':
                left *= right
            else:
                raise ValueError("Unsupported operator: '/'")
        return left, next_index

    def parse_expression(s, index):
        left, next_index = parse_term(s, index)
        while next_index < len(s) and (s[next_index] == '+' or s[next_index] == '-'):
            operator = s[next_index]
            right, next_index = parse_term(s, next_index + 1)
            if operator == '+':
                left += right
            else:
                left -= right
        return left, next_index

    result, _ = parse_expression(s, 0)
    return result
n=int(input())
expression = str(input())
result = evaluate_expression(expression)
print(result)