#include <bits/stdc++.h>
#ifdef dbg
#define D(...) fprintf(stderr, __VA_ARGS__)
#define DD(...) D(#__VA_ARGS__ " = "), debug_helper::debug(__VA_ARGS__), D("\n")
#include "C:\Users\wsyear\Desktop\OI\templates\debug.hpp"
#else
#define D(...) ((void)0)
#define DD(...) ((void)0)
#endif
#define rep(i, j, k) for (int i = (j); i <= (k); ++i)
#define per(i, j, k) for (int i = (j); i >= (k); --i)
#define SZ(v) int((v).size())
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
using ll = long long;
using pii = std::pair<int, int>;
using pll = std::pair<ll, ll>;

using namespace std;

const int maxn = 1000010;
const int maxv = 1000000;

int n, a[maxn], cnt[maxn];

int main() {
  cin.tie(nullptr) -> ios::sync_with_stdio(false);
  cin >> n;
  rep (i, 1, n) cin >> a[i], cnt[a[i]]++;
  ll ans = 0;
  rep (x, 1, maxv) {
    int y = x + 1;
    while (true) {
      ll tmp = 1ll * y * y - 1ll * x * x;
      if (tmp > maxv) break;
      if (x == tmp) ans += 1ll * cnt[x] * (cnt[x] - 1);
      else ans += 1ll * cnt[x] * cnt[tmp];
      y++;
    }
  }
  cout << ans << '\n';
}