def FIzzBuzzString(N):
    S = ''
    for n in range(1, N + 1):
        if (n % 3 == 0) and (n % 5 == 0):
            S += 'FizzBuzz'
            continue
        elif n % 3 == 0:
            S += 'Fizz'
        elif n % 5 == 0:
            S += 'Buzz'
        else:
            S += 'n'
    return S

def count_z(N):
    S = FIzzBuzzString(N)
    S = list(S)
    result = S.count('z')
    return result

if __name__ == '__main__':
    N = int(input())
    print(count_z(N))