import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int sum = 0;
        for (int i = 0; i < n - 1; i++) {
            sum += sc.nextInt();
        }
        int ans = 0;
        for (int i = 0; i <= 100; i++) {
            if ((sum + i) % n == 0) {
                ans++;
            }
        }
        System.out.println(ans);
    }
    
}