# Returns result and index
def para(s: str, i: int) -> tuple[int, int]:
    a, b = 0, 0
    operator = '+'
    c = s[i]
    while c != ')':
        c = s[i]
        if c == '(':
            i += 1
            b, i = para(s, i)
            match operator:
                case '+':
                    a = a + b
                case '-':
                    a = a - b
                case '*':
                    a = a * b
        elif c.isdigit():
            b = int(c)
            match operator:
                case '+':
                    a = a + b
                case '-':
                    a = a - b
                case '*':
                    a = a * b
            i += 1
        else:
            operator = c
            i += 1

    return (a, i)

def main():
    s: str = input()

    # Wish I could just use eval() but it uses pemdas
    a, b = 0, 0
    operator = '+'
    i = 0
    while i < len(s):
        c = s[i]
        if c == '(':
            i += 1
            b, i = para(s, i)
            match operator:
                case '+':
                    a = a + b
                case '-':
                    a = a - b
                case '*':
                    a = a * b
        elif c.isdigit():
            b = int(c)
            match operator:
                case '+':
                    a = a + b
                case '-':
                    a = a - b
                case '*':
                    a = a * b
            i += 1
        else:
            operator = c
            i += 1
    print(a)

if __name__ == '__main__':
    main()