n = int(input())

x = str()

x2 = str()

k = int(0)

k2 = int(0)

for i in range(n):

x = ''

x2 = ''

x = input()

for j in x:

 x2 = str(j) + str(x2)

for z in x2:

 k2 += 1

 if k2 == 2:

  if z == '5':

   k +=1

  k2 = 0

  break

print(k)