/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.06.25 23:54:05
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n;cin >> n;
    int cnt = 0;
    for (int x = 0; x <= n; x++) {
        for (int y = 0; y <= n; y++) {
            if (0 <= n - x - y) {
                cnt++;
            }
        }
    }
    cout << cnt << endl;
    return 0;
}