suma=0
x=float(input())
while x!=0:
if x%3==0:
if x%5==0:
suma=suma+1
x=float(input())
print(suma)
c3VtYT0wICAgIAp4PWZsb2F0KGlucHV0KCkpCndoaWxlIHghPTA6IAoJaWYgeCUzPT0wOgoJCWlmIHglNT09MDoKCQkJc3VtYT1zdW1hKzEKCXg9ZmxvYXQoaW5wdXQoKSkKCgpwcmludChzdW1hKQo=