#include <iostream>
#include <vector>
#include <string>
#include <utility>
#include <algorithm>
#include <climits>
#include <map>
#include <queue>
#include <cmath>

using namespace std;

using int64 = long long;

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

    int ans = 0;
    for (int i=0; i<=n; i++) {
        for (int j=0; j<=n-i; j++) {
            int k = n - i - j;
            if (0<=k && k<=n) ans++;
        }
    }

    cout << ans << endl;
}