use proconio::{fastout, input};

#[fastout]
fn main() {
    input! {
        n: usize,
        a: [u8; n - 1],
    }

    println!("{}", output(solve(a)))
}

fn solve(a: Vec<u8>) -> u8 {
    let n = (a.len() + 1) as u16;
    let sum_a = a.into_iter().map(|a| a as u16).sum::<u16>();
    ((sum_a + 100) / n - sum_a.saturating_sub(1) / n) as u8
}

fn output(ans: u8) -> u8 {
    ans
}