#include <stdio.h>

int main(void) {

	int n,a[10];
	int i, j;
	int sum;
	int count = 0;	
	scanf("%d", &n);
	sum = 0;
	for(i = 0;i < n - 1;i++){
		scanf("%d", &a[i]);
		sum += a[i];
	}
	for(j = 0;j <= 100;j++){
		if((sum + j) % n == 0){
			count++;
		}
	}
	printf("%d\n", count);

	return 0;
}