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

    println!(
        "{}",
        match s {
            "? 3 2" | "2 3 ?" => "1",
            "? 2 3" | "3 2 ?" => "4",
            "2 ? 3" | "3 ? 2" => "14",
            _ => unreachable!(),
        }
    );
}