#include "bits/stdc++.h"
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
const ll INF = (1LL << 61);
ll mod = 1000000007;

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N; cin >> N;
	vector<int>A(N - 1);
	for (int i = 0; i < N - 1; i++) {
		cin >> A[i];
	}
	int sum = 0;
	for (int i = 0; i < N - 1; i++)sum += A[i];
	int ans = 0;
	for (int i = 0; i <= 100; i++) {
		if ((sum + i) % N == 0)ans++;
	}
	cout << ans << endl;
	return 0;
}