def main():
    N = int(input())
    count = 0
    count += (N // 15) * 4
    count += (((N // 5) + (N // 3)) - (N // 15) * 2) * 2
    #for i in range(1, N+1):
    #    if i % 15 == 0:
    #        count += 4
    #    elif i % 3 == 0 or i % 5 == 0:
    #        count += 2
    print(count)

if __name__ == '__main__':
    main()