def main():
    N = int(input())
    countz = 0
    numbers = [n for n in range(1, N + 1)]
    for i in numbers:
        if i % 15 == 0:
            countz += 4
        elif i % 5 == 0:
            countz += 2
        elif i % 3 == 0:
            countz += 2

    print(countz)

if __name__ == '__main__':
    main()