fn read() -> (usize, Vec<usize>) {
    let mut s = String::new();
    use std::io::*;
    std::io::stdin().read_to_string(&mut s).unwrap();
    let mut it = s.trim().split_whitespace();
    let n: usize = it.next().unwrap().parse().unwrap();
    (n, it.flat_map(|s| s.parse()).collect())
}

fn main() {
    let (n, a) = read();
    assert!(1 <= n && n <= 10);
    assert!(a.len() == n - 1 && a.iter().all(|a| *a <= 100));
    let mut ans = 0;
    for i in 0..=100 {
        let sum = a.iter().sum::<usize>() + i;
        if sum % n == 0 {
            ans += 1;
        }
    }
    println!("{}", ans);
}