#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}

int main() {
	int n = ri();
	int sum = 0;
	for (int i = 1; i < n; i++) sum += ri();
	
	int res = 0;
	for (int i = 0; i <= 100; i++) if ((sum + i) % n == 0) res++;
	printf("%d\n", res);
	
	return 0;
}