use std::io::{self, Read};
use std::iter::Peekable;

struct Scanner<S: Iterator> {
    stream: Peekable<S>,
}

impl<S: Iterator<Item = u8>> Scanner<S> {
    pub fn new(stream: Peekable<S>) -> Scanner<S> {
        Scanner { stream: stream }
    }

    pub fn next_usize(&mut self) -> Option<usize> {
        self.skip_unprintable();
        let mut n: usize = 0;

        if let None = self.stream.peek() {
            return None;
        }

        while let Some(b) = self.stream.next() {
            if b < 33 || b > 126 {
                break;
            }
            if b < b'0' || b > b'9' {
                return None;
            }
            n *= 10;
            n += (b - b'0') as usize;
        }
        Some(n)
    }

    pub fn next_u64(&mut self) -> Option<u64> {
        self.skip_unprintable();
        let mut n: u64 = 0;

        if let None = self.stream.peek() {
            return None;
        }

        while let Some(b) = self.stream.next() {
            if b < 33 || b > 126 {
                break;
            }
            if b < b'0' || b > b'9' {
                return None;
            }
            n *= 10;
            n += (b - b'0') as u64;
        }
        Some(n)
    }

    fn skip_unprintable(&mut self) {
        while let Some(&b) = self.stream.peek() {
            if b >= 33 && b <= 126 {
                break;
            }
            self.stream.next();
        }
    }
}

fn main() {
    let mut scanner = Scanner::new(io::stdin().bytes()
                                   .filter_map(|b| b.ok()).peekable());

    let n = scanner.next_usize().unwrap();

    let mut sum = 0;
    for _ in 0..n {
        sum += scanner.next_u64().unwrap();
    }

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