n = int(input())
FizzBuzzString_count = 0

for i in range(1, n+1):
    if i % 3 == 0 or i % 5 == 0:
        if i % 15 == 0:
            FizzBuzzString_count += 4
        else:
            FizzBuzzString_count += 2

print(FizzBuzzString_count)