N = int(input())
t = 0
for i in range(1, N + 1):
    if i % 15 == 0:
        t += 4
    elif i % 3 == 0 or i % 5 == 0:
        t += 2
    # elif i % 5 == 0:
    #     t += 2
# print(l)
# print(l.count("z"))
print(t)