fn main() {
    let n: usize = read();
    let a: Vec<usize> = read_vec();
    
    let mut sum: usize = 0;
    for i in 0..n - 1 {
        sum += a[i];
    }

    let mut ans: usize = 0;
    for i in sum..=sum + 100 {
        if i % n == 0 {
            ans += 1;
        }
    }
    println!("{}", ans);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>().split_whitespace()
        .map(|e| e.parse().ok().unwrap()).collect()
}