def X(mid):
    global N
    return N*N-mid*mid
def bsL(target,left,right):
  while True:
    mid=(left+right)//2
    mid2=X(mid)
    if mid2==target:
      return 1
    if right-left==1:
      return 0
    if mid2>target:
      left=mid
    else:
      right=mid
N=int(input())
ans=0
for x in range(N):
    ans+=bsL(x*x,0,N)
print(ans)