1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#include <bits/stdc++.h>
using namespace std;

#define ll long long

map<int, ll> sums;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n;
    cin >> n;

    ll wyn = 0ll;

    for (int a = 1; a <= n; a++) {
        for (int b = a; b <= n; b++) {
            sums[a * a + b * b]++;
        }
    }

    for (int d = n; d > 0; d--) {
        for (int h = d - 1; h > 0; h--) {
            wyn += sums[d * d - h * h];
        }
    }

    cout << wyn << "\n";
}