from bisect import bisect_right

n = int(input())
Sqr = [0 for _ in range(n + 1)]
for i in range(n + 1):
    Sqr[i] = i**2

ans = 0
for i in range(1, n):
    j = (n - i) * (n + i)
    ind = bisect_right(Sqr, j)
    if Sqr[ind - 1] == j:
        ans += 1
print(ans)