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 = unsafe {
                    std::str::from_utf8_unchecked(buf).parse().ok().unwrap()
                };
                r.consume(used);
                return res;
            }
            tmp.extend_from_slice(buf);
            r.consume(used);
        }
    }
}

fn main() {
    let stdin = std::io::stdin();
    let mut reader = std::io::BufReader::new(stdin.lock());

    let n: usize = io::scan(&mut reader);
    println!("{}", (0..n).map(|_| io::scan::<_, u64>(&mut reader)).sum::<u64>());
}