#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n; cin >> n;
    vector<int> a(n + 1);
    map<int, int> cnt;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        cnt[a[i]]++;
    }
    int ans = 0;
    for (int i = 1; i <= n; i++) {
        for (int j = a[i] + 1; j * j - a[i] * a[i] <= 1e6; j++) {
            ans += cnt[j * j - a[i] * a[i]];
        }
    }
    cout << ans << '\n';
    return 0;
}