#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O0")
typedef long long int ll;
typedef long double ld;
const ll mod = 1e9+7;
const ll INF = 1e18;
#define rep(i,n) for (ll i = 0; i < (n); ++i)
#define Rep(i,a,n) for (ll i = (a); i < (n); ++i)
#define All(a) (a).begin(),(a).end()
#define Pi acos(-1)
using Graph = vector<vector<ll>>;
using V = vector<ll>;
using P = pair<ll,ll>;

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(false);
  cout << setprecision(15) << fixed;

  ll n;
  cin >> n;
  V a(n-1);
  ll t = 0;
  rep(i,n-1) {
    cin >> a[i];
    t += a[i];
  }
  ll ans = 0;
  rep(i,101) {
    ll s = t + i;
    if (s % n == 0) {
      ++ans;
    }
  }
  cout << ans << '\n';
}