n = int(input());
i = 0
x = 0
s = 0
for i in range(1,n+1):
    for x in range(i,n +1):
        if i != x:
            if (i + x) % 3 == 0 or (i + x) % 7 == 0:
                s += 1
print(s)
            
/**************************************************************
	Problem: 1086
	User: admin
	Language: Python
	Result: Accepted
	Time:89 ms
	Memory:34480 kb
****************************************************************/