#include using namespace std; // #include // using namespace atcoder; #define rep(i, n) for (ll i = 0; i < (n); ++i) #define rep1(i, n) for (ll i = 1; i <= n; ++i) #define reps(i, s, e) for (ll i = s; i <= e; ++i) #define rrep(i, n) for (ll i = n - 1; 0 <= i; --i) #define all(v) v.begin(), v.end() #define endl "\n" template bool chmax(T& a, const T& b) { if (a < b) { a = b; return 1; } return 0; } template bool chmin(T& a, const T& b) { if (b < a) { a = b; return 1; } return 0; } using ll = long long; using ld = long double; using cp = complex; using pa = pair; using tup = tuple; using vp = vector>; using vtup = vector>; using st = string; using vs = vector; using vc = vector; using vvi = vector>; using vvc = vector>; using vi = vector; const ll MOD1 = 1000000007; const ll MOD2 = 998244353; const ll INF = (1LL << 60); void init() { ios_base::sync_with_stdio(false); cin.tie(NULL), cout.tie(NULL); cout << fixed << setprecision(15); } int main() { init(); ll n; cin >> n; ll ans = 0; rep(i, n + 1) rep(j, n + 1) { ll k = n - i - j; if (k >= 0) { ans++; } } cout << ans << endl; }