def main():
    input()
    a=list(map(int,input().split()))
    total=sum(a)
    n=len(a)+1
    cnt=0
    # nで割ったあまりが0ならok
    for i in range(0,100):
        if (total+i)%n==0:
            cnt+=1
    print(cnt)
    


if __name__ == "__main__":
    main()