import java.util.Arrays;
import java.util.Scanner;

public class HelloWorld {

	    public static void main(String[] args){

	        Scanner sc = new Scanner(System.in);
	        int number_total = sc.nextInt();
	        int sum = 0;
	        int count = 0;

	        for (int i = 0; i < number_total - 1; i ++) {
	        	sum += sc.nextInt();
	        }

	        for (int i = sum; i <= sum + 100; i ++) {
	        	if (i % number_total == 0) {
	        		count +=1;

	        	}
	        }

	        System.out.println(count);
	    }
	}