use std::io::*;
use std::str::FromStr;

#[allow(dead_code)]
fn get_line() -> String {
    let stdin = stdin();
    let mut line = String::new();
    stdin.lock().read_line(&mut line).expect("io error.");
    line.trim().to_string()
}

#[allow(dead_code)]
fn cast<T: FromStr>(s: &str) -> T {
    s.parse().ok().expect("parse error.")
}

#[allow(dead_code)]
fn get_vec<T: FromStr>() -> Vec<T> {
    (&get_line()).split(' ').map(cast::<T>).collect()
}

static MOD: u64 = 1_000_003;

fn mypow(x: u64, a: u64) -> u64 {
    if a == 0 {return 1};
    if a == 1 {return x % MOD};

    if a % 2 == 0 {
        mypow(x * x % MOD, a / 2)
    } else {
        mypow(x, a - 1) * x % MOD
    }
}

fn main() {
    let v: Vec<u64> = get_vec();
    let x = v[0];
    let av: Vec<u64> = get_vec();

    let mut ans: u64 = 0;
    for a in av {
        ans += mypow(x, a);
        ans %= MOD;
    }

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