n = int(input())
n_list = range(1, n+1)
z = 0

for i in n_list:
    if i % 15 == 0:
        z += 4#FizzBuzz
    elif i % 3 == 0 or i % 5 == 0:
        z += 2#Fizz
#    elif i % 5 == 0:
#        z += 2#Buzz

print(z)