n = int(input())
s = ''

for i in range(1, n + 1):
    if i % 3 == 0 and i % 5 == 0:
        s += 'FizzBuzz'
    elif i % 3 == 0:
        s += 'Fizz'
    elif i % 5 == 0:
        s += 'Buzz'
    else:
        s += str(i)
        
print(s.count('z'))