import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] a = new int[n - 1];
		for (int i = 0; i < n - 1; i++) {
			a[i] = sc.nextInt();
		}
		sc.close();

		int sum = 0;
		for (int i = 0; i < a.length; i++) {
			sum += a[i];
		}

		int ans = 0;
		for (int i = 0; i <= 100; i++) {
			if ((sum + i) % n == 0) {
				ans++;
			}
		}
		System.out.println(ans);
	}
}