mod io {
    use std::io::{BufRead, ErrorKind};
    use std::str::FromStr;

    pub fn scan<R: BufRead, T: FromStr>(r: &mut R) -> T {
        let mut tmp = Vec::new();
        loop {
            let buf = match r.fill_buf() {
                Ok(buf) => buf,
                Err(e) if e.kind() == ErrorKind::Interrupted => continue,
                Err(e) => panic!(e), 
            };
            let (done, used, buf) = {
                match buf.iter().position(u8::is_ascii_whitespace) {
                    Some(i) => (i > 0 || tmp.len() > 0, i + 1, &buf[..i]),
                    None => (buf.is_empty(), buf.len(), buf),
                }
            };
            if done {
                let buf = {
                    if tmp.is_empty() {
                        buf
                    } else {
                        tmp.extend_from_slice(buf);
                        &tmp
                    }
                };
                let res = std::str::from_utf8(buf).unwrap().parse().ok().unwrap();
                r.consume(used);
                return res;
            }
            tmp.extend_from_slice(buf);
            r.consume(used);
        }
    }
}

#[allow(unused_macros)]
fn run<R: std::io::BufRead, W: std::io::Write>(reader: &mut R, writer: &mut W) {
    macro_rules! scan {
        ([$t:tt; $n:expr]) => ((0..$n).map(|_| scan!($t)).collect::<Vec<_>>());
        (($($t:tt),*)) => (($(scan!($t)),*));
        ([u8]) => (scan!(String).into_bytes());
        ($t:ty) => (io::scan::<_, $t>(reader));
    }
    macro_rules! println {
        ($($arg:tt)*) => (writeln!(writer, $($arg)*).ok());
    }

    let n = scan!(usize);
    let a = scan!([u64; n]);
    println!("{}", a.iter().sum::<u64>());
}

fn main() {
    let (stdin, stdout) = (std::io::stdin(), std::io::stdout());
    let mut reader = std::io::BufReader::new(stdin.lock());
    let mut writer = std::io::BufWriter::new(stdout.lock());
    run(&mut reader, &mut writer);
}