inp = int(input())

ls = [i for i in range(1, inp+1)]
#print(ls)

als = []
for i in ls:
    if i % 15 == 0:
        als.append('FizzBuzz')
    elif i % 5 == 0:
        als.append('Buzz')
    elif i % 3 == 0:
        als.append('Fizz')
    else:
        als.append(str(i))
#print(als)
ans = "".join(als)
n = ans.count('z')
print(n)