#![allow(non_snake_case, unused_imports)]

use proconio::{input, marker::Usize1, marker::Chars};
use itertools::Itertools;

#[allow(unused_macros)]
macro_rules! d {
    ( $( $x:expr ),* $(,)? ) => {
        eprintln!(
            concat!( $( stringify!($x), "={:?} " ),* ),
            $( $x ),*
        );
    };
}

#[allow(dead_code)]
fn yn(b: bool) -> &'static str {
    if b { "Yes" } else { "No" }
}

fn main() {
    input! {
        Y: i64,
        N: usize,
        A: [i64; N],
    }

    let x = Y - A.iter().sum::<i64>();
    if x < 0 {
        println!("red");
    } else {
        println!("{}", x);
    }
}