/* -*- coding: utf-8 -*-
 *
 * 1406.cc:  No.1406 Test - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 10;
const int MAX_A = 100;

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int sum = 0;
  for (int i = 1; i < n; i++) {
    int ai;
    scanf("%d", &ai);
    sum += ai;
  }

  int c = 0;
  for (int a = 1; a <= MAX_A; a++)
    if ((sum + a) % n == 0) c++;

  printf("%d\n", c);
  return 0;
}