N = int(input())
if N == 2:
    lsA = [int(input())]
else:
    lsA = list(map(int,input().split()))
sumA = sum(lsA)
cnt = 0
for i in range(101):
    su = N*i
    a = su-sumA
    if 0 <= a <= 100:
        cnt += 1
print(cnt)