def main():
    N = int(input())
    FizzBuzzString = [0] * (N)

    for i in range(N):
        val = i + 1
        if val % 3 == 0 and val % 5 == 0:
            FizzBuzzString[i] = 'FizzBuzz'
        elif val % 3 == 0:
            FizzBuzzString[i] = 'Fizz'
        elif val % 5 == 0:
            FizzBuzzString[i] = 'Buzz'
        else:
            FizzBuzzString[i] = str(val)

    FizzBuzzString = ''.join(FizzBuzzString)

    ans = sum(word.count('z') for word in FizzBuzzString)
    print(ans)

if __name__=='__main__':
    main()