import sys
k = input()
count = 0
count += (k // 15) * 16
for i in range(1,(k%15)+1):
    if i % 3 == 0 and i % 5 == 0:
        count += 4
    elif i % 3 == 0:
        count += 2
    elif i % 5 == 0:
        count += 2
print count