n = int(input()) lst = input().split() for i in range(len(lst)): lst[i] = int(lst[i]) cnt = 0 for x in range(n): num = lst[x] #a,b,c,d d = num%10 a = num//1000 c = num%100//10 b = num//100 %10 if d-a-b-c>0: cnt +=1 print(cnt)