N = int(input())
cnt = 0
import math
for i in range(1,N):
    l = (N+i)*(N-i)
    p = math.sqrt(l)
    t = math.ceil(p)
    m = math.floor(p)
    if p == t and p > 0:
        cnt += 1
        #print(p,t,m)
print(cnt)