use std::io::*;

fn parse(s: &[char]) -> i64 {
    let mut i = 0;
    let mut mul = 1;
    if s[0] == '+' || s[0] == '-' {
        i += 1;
        if s[0] == '-' {
            mul = -1;
        }
    }

    let mut res = 0;
    while i < s.len() {
        res = res * 10 + (s[i] as u8 - '0' as u8) as i64;
        i += 1;
    }
    res * mul
}

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 num = Vec::new();
    let mut tmp = Vec::new();
    let mut ops = ' ';
    for i in 0..s.len() {
        if 0 < i && ops == ' ' && (s[i] == '+' || s[i] == '-') {
            ops = s[i];
            num.push(parse(&tmp));
            tmp.clear();
        } else {
            tmp.push(s[i]);
        }
    }
    num.push(parse(&tmp));
    println!(
        "{}",
        if ops == '+' {
            num[0] - num[1]
        } else {
            num[0] + num[1]
        }
    )
}