use proconio::input;

fn main() {
    input! {
        a: u32,
        op: char,
        b: u32,
    }

    let mut result = a as i32;

    match op {
        '+' => result += b as i32,
        '-' => result -= b as i32,
        _ => unreachable!(),
    }

    println!("{}", result);
}