#N = input()
N = int(input())
#s = input().split()
#hw = [[int(i) for i in input().split()] for _ in range(N)]
#N, M = map(int, input().split())
A = list(map(int, input().split()))

sum = 0
for i in range(N - 1):
    sum += A[i]

k = 0
for i in range(101):
    if ((sum + i) % N == 0):
        k += 1

print(k)