#include<bits/stdc++.h>

using namespace std;
using ll = long long;


int main()
{
    int n; cin >> n;
    ll ans = 0;
    for(int i = 0; i < n; i++) {
        for(int j = i; j < n; j++) {
            int k = n - i - j;
            if(k < j)continue;
            if(i == j && j == k)ans++;
            else if(i == j || j == k || k == i)ans += 3;
            else ans += 6;
        }
    }
    cout << ans << endl;
}