use std::io::{self, BufRead};

#[allow(dead_code)]
mod cc_input {
    pub fn read_string() -> String {
        let mut s = String::new();
        std::io::stdin().read_line(&mut s).ok();
        return s.trim().to_string();
    }

    pub fn read<T: std::str::FromStr>() -> T {
        read_string().parse().ok().unwrap()
    }

    pub fn read_vec<T: std::str::FromStr>() -> Vec<T> {
        read_string()
            .split_whitespace()
            .map(|e| e.trim().parse().ok().unwrap())
            .collect()
    }

    pub fn read_pair<T: std::str::FromStr + std::clone::Clone>() -> (T, T) {
        let xs: Vec<T> = read_vec();
        return (xs[0].clone(), xs[1].clone());
    }

    pub fn drop_line() {
        read_string();
    }
}

fn main() {
    let mut sum: i64 = 0;
    let stdin = io::stdin();

    cc_input::drop_line();

    for line in stdin.lock().lines() {
        sum += line.unwrap().parse::<i64>().ok().unwrap();
    }

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