import sys
INF = float('inf')
#10**20,2**63,float('inf')
MOD = 10**9 + 7
MOD2 = 998244353
#from collections import defaultdict
def solve():
    def II(): return int(sys.stdin.readline())
    def LI(): return list(map(int, sys.stdin.readline().split()))
    def LC(): return list(input())
    def IC(): return [int(c) for c in input()]
    def MI(): return map(int, sys.stdin.readline().split())
    N = II()
    from collections import defaultdict
    Flag = defaultdict(lambda:False)
    for y in range(1,200000):
        Flag[y**2] = True
    Ans = 0
    for x in range(1,N+1):
        if Flag[(N-x)*(N+x)]:
            Ans += 1
    print(Ans)
    return
solve()
#sys.setrecursionlimit(10 ** 6)#再帰関数ではコメントにしないこと！！