#include "testlib.h"
#include <vector>
#include <iostream>

const int MIN_N = 1;
const int MAX_N = 10LL;

const int MIN_A = 0;
const int MAX_A = 100;

int main(int argc, char** argv) {
    registerValidation(argc, argv);

    const int N = inf.readInt(MIN_N, MAX_N, "N");
    inf.readEoln();
    std::vector<int> A(N - 1);
    for (int i = 0; i + 1 < N; ++i) {
        A[i] = inf.readInt(MIN_A, MAX_A, "A_i");
        if (i + 2 == N) {
            inf.readEoln();
        } else {
            inf.readSpace();
        }
    }
    inf.readEof();

    int ans = 0;
    for (int i = MIN_A; i <= MAX_A; ++i) {
        int sum = i;
        for (int x: A) {
            sum += x;
        }
        if (sum % N == 0) {
            ans += 1;
        }
    }
    std::cout << ans << std::endl;

    return 0;
}