n = int(input())

numbers = list(map(int, input().split()))

convey=[]

for i in numbers:

s=str(i)[::-1]
list1=[]
for j in s:
    list1.append(int(j))
    count=list1[0]-list1[1]-list1[2]-list1[3]
if count>0:
    convey.append(s)

print(len(convey))