use std::{collections::*, io::Read};

fn take_token<R: std::io::BufRead>(cin: &mut R) -> String {
    cin.bytes()
        .map(|c| c.unwrap() as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect::<String>()
}
#[allow(unused)]
macro_rules! scan {
    ($io:expr => $t:ty) => (take_token(&mut $io).parse::<$t>().unwrap());
    ($io:expr => $t:tt * $n:expr) => ((0..$n).map(|_| scan!($io => $t)).collect::<Vec<_>>());
    ($io:expr => $($t:tt),*) => (($(scan!($io => $t)),*));
}
#[allow(unused)]
macro_rules! scan_itr {
    ($io:expr => $t:tt * $n:expr) => ((0..$n).map(|_| scan!($io => $t)));
}

fn main() {
    solve(std::io::stdin().lock())
}

fn solve<R: std::io::BufRead>(mut cin: R) {
    let n = scan!(cin => i32);
    let total = scan_itr!(cin => i64 * n).sum::<i64>();
    println!("{}", total);
}