fn getval(a: &Vec<char>) -> isize {
    a.iter().map(|c| (*c).to_string()).collect::<Vec<String>>().join("").parse::<usize>().unwrap() as isize
}

fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();

    let mut is_a_minus = false;
    let mut is_b_minus = false;
    let mut a: Vec<char> = vec![];
    let mut b: Vec<char> = vec![];
    let mut check: usize = 0;
    s.trim().chars().for_each(|c| {
        match check {
            0 => { 
                if c == '-' { is_a_minus = !is_a_minus; }
                else if c == '+' {}
                else { check += 1; a.push(c); }
            },
            1 => {
                if c == '-' || c == '+' { check += 1; if c == '-' { is_b_minus = !is_b_minus; } }
                else { a.push(c); }
            },
            2 => {
                if c == '-' || c == '+' { if c == '-' { is_b_minus = !is_b_minus; } }
                else { check += 1; b.push(c); }
            },
            3 => {
                b.push(c);
            },
            _ => {}
        }
    });
    println!("{}", getval(&a) * if is_a_minus { -1 } else { 1 } + getval(&b) * if is_b_minus { 1 } else { -1 });
}