#[macro_export]
macro_rules! setup {
    { mut $input:ident: SplitWhitespace $(,)? } => {
        use std::io::Read;
        let mut buf = String::new();
        std::io::stdin().read_to_string(&mut buf).ok();
        let mut $input = buf.split_whitespace();
    };
}

#[macro_export]
macro_rules! parse_next {
    ($str_iter:expr) => {
        $str_iter.next().unwrap().parse().ok().unwrap()
    };
}

fn main() {
    setup! { mut input: SplitWhitespace };

    let n: usize = parse_next!(input);
    let k: usize = parse_next!(input);
    let a: Vec<usize> = (0..n).map(|_| parse_next!(input)).collect();

    let ans = (|| match k % (n + 1) {
        0 => (0..n).fold(0, |acc, i| acc ^ a[i]),
        _ => a[(k % (n + 1)) - 1],
    })();

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