use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let s: Vec<char> = itr.next().unwrap().chars().collect();

    let mut ops = Vec::new();
    let mut num = Vec::new();
    let mut now = 0;
    let mut ok = false;
    let mut head = false;
    let n = s.len();
    for i in 0..n {
        if s[i] == '+' || s[i] == '-' {
            ops.push(s[i]);
            if i == 0 {
                head = true;
            }
            if ok {
                num.push(now);
                now = 0;
                ok = false;
            }
        } else {
            ok = true;
            now = now * 10 + (s[i] as u8 - '0' as u8) as i64;
        }
    }
    num.push(now);
    let mut ans = 0;
    match ops.len() {
        1 => {
            ans = if ops[0] == '+' {
                num[0] - num[1]
            } else {
                num[0] + num[1]
            }
        }
        2 => {
            ans = if head {
                if ops[1] == '+' {
                    -num[0] - num[1]
                } else {
                    -num[0] + num[1]
                }
            } else {
                if ops[0] == '+' {
                    num[0] + num[1]
                } else {
                    num[0] - num[1]
                }
            }
        }
        3 => {
            ans = if ops[1] == '+' {
                -num[0] + num[1]
            } else {
                -num[0] - num[1]
            }
        }
        _ => {}
    }
    println!("{}", ans);
}