fn main() {
    let mut xx = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut xx).ok();
    let xx: Vec<usize> = xx.split_whitespace().skip(1).flat_map(str::parse).collect();

    let n = xx.len() + 1;
    let sum = xx.iter().sum::<usize>();
    let answer = (0..=100).filter(|&i| (sum + i) % n == 0).count();

    println!("{answer}");
}