// #define _GLIBCXX_DEBUG
#include<bits/stdc++.h>
#include <atcoder/all>
#define rep(i, n) for (long long i = 0; i < (n); i++)
#define rep1(i, n) for(long long i = 1; i <= (n); i++)
#define all(v) v.begin(),v.end()
#define decimal(n) cout << fixed << setprecision(n);
using namespace std; 
using namespace atcoder;
using ll = long long; using vl = vector<ll>; using P = pair<ll,ll>;
using vvl = vector<vl>; using vc = vector<char>; using vvc = vector<vc>;
using mint = modint998244353;
// using mint = modint1000000007;
const ll MOD = 998244353;
const ll MAX = 2000100; const ll inf = 3e18; const long double pi = acos(-1);
template<class T>bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; }
template<class T>bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; }
ll lcm(ll a,ll b){ return (a*b) / gcd(a,b); }



int main(){
  ll n; cin >> n;

  set<ll> s;
  for(ll i=1; i <= 200000; i++){
    s.insert(i * i);
  }

  ll ans = 0;
  for(ll i = 1; i <= n; i++){
    if(s.count((n - i) * (n + i))) ++ans;
  }

  cout << ans << endl;

}