#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <exception>
#include <functional>
#include <iomanip>
#include <ios>
#include <iostream>
#include <map>
#include <memory>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

const int MOD = 1e9 + 7;

using ld = long double;
using ll = long long;
using ull = unsigned long long;


template<class T, class U> inline bool chmin(T& a, const U& b) { if (a > b) { a = b; return 1; } return 0; }
template<class T, class U> inline bool chmax(T& a, const U& b) { if (a < b) { a = b; return 1; } return 0; }

template<class T> auto min(const T& a) { *min_elemenet(all(a)); }
template<class T> auto max(const T& a) { *max_elemenet(all(a)); }

// const ll MOD = 1e9 + 7;
const ll INF = 1 << 30;
const ll INFLL = 1LL << 60;
const ld EPS = 1e-9;

const ll dx[] = {0, 1, 0, -1, 1, -1, 1, -1};
const ll dy[] = {1, 0, -1, 0, 1, -1, -1, 1};

#define all(v) begin(v), end(v)

struct mint {
  ull a;
 
  constexpr mint(const ull x = 0) noexcept : a(x % MOD) {}
  constexpr mint operator + (const mint rhs) const noexcept { return mint(*this) += rhs; }
  constexpr mint operator - (const mint rhs) const noexcept { return mint(*this) -= rhs; }
  constexpr mint operator * (const mint rhs) const noexcept { return mint(*this) *= rhs; }
  constexpr mint operator / (const mint rhs) const noexcept { return mint(*this) /= rhs; }
  constexpr mint &operator += (const mint rhs) noexcept {
    a += rhs.a;
    if (a >= MOD) a -= MOD;
    return *this;
  }
  constexpr mint &operator -= (const mint rhs) noexcept {
    if (a < rhs.a) a += MOD;
    a -= rhs.a;
    return *this;
  }
  constexpr mint &operator *= (const mint rhs) noexcept {
    a = a * rhs.a % MOD;
    return *this;
  }
  constexpr mint &operator /= (mint rhs) noexcept {
    ull exp = MOD - 2;
    while (exp) {
      if (exp % 2) *this *= rhs;
      rhs *= rhs;
      exp /= 2;
    }
    return *this;
  }
  constexpr mint pow(const mint &a, ull n) noexcept {
    if (n <= 0) return 1;
    auto t = pow(a, n / 2);
    t = t * t;
    if (n & 1) t = t * a;
    return t;
  }
};
 
long long modpow(long long a, long long n, long long m = MOD) {
  if (n <= 0) return 1LL;
  if (n % 2LL) return a * modpow(a, n-1) % MOD;
  long long t = modpow(a, n/2);
  return t % MOD * t % MOD;
}

struct Combination {
  const int MAX = 2e5 + 5;
  vector<long long> fact, invfact;
 
  Combination() {
    fact.resize(MAX);
    invfact.resize(MAX);
 
    fact[0] = 1;
 
    for (int i = 1; i < MAX; ++i) {
      fact[i] = fact[i-1] * i % MOD;
    }
 
    invfact[MAX-1] = modpow(fact[MAX-1], MOD-2);
 
    for (int i = MAX-1; i > 0; --i) {
      invfact[i-1] = invfact[i] * i % MOD;
    }
  }
 
  long long nCr(int n, int r) {
    long long a = fact[n];
    long long b = invfact[r] * invfact[n-r] % MOD;
 
    return a * b % MOD;
  }
};

struct UnionFind {
  int n;
  vector<int> parent, siz;
 
  UnionFind(int n) : n(n) {
    parent.resize(n);
    siz.resize(n);
 
    for (int i = 0; i < n; ++i) {
      parent[i] = i;
      siz[i] = 1;
    }
  }
 
  int root(int x) {
    if (parent[x] == x) return x;
    return parent[x] = root(parent[x]);
  }
 
  bool unite(int x, int y) {
    x = root(x);
    y = root(y);
 
    if (x == y) return false;
 
    if (siz[x] < siz[y]) swap(x, y);
    parent[y] = x;
    siz[x] += siz[y];
 
    return true;
  }
 
  int same(int x, int y) {
    return root(x) == root(y);
  }
 
  int size(int x) {
    return siz[root(x)];
  }
};

struct RollingHash {
  int n;
  vector<ull> HS;
  vector<ull> mp;

  const ull b = 3491;

  RollingHash(string& S) {
    n = S.size();
    mp.assign(n, 0);
    HS.assign(n+1, 0);

    for (int i = 0; i < n; ++i) {
      mp[i] = modpow(b, i);
    }
    
    for (int i = 0; i < n; ++i) {
      HS[i+1] = HS[i] + mp[n-i-1] * (S[i] - '0') % MOD;
      HS[i+1] %= MOD;
    }
  }

  int getHash(int l, int r) { 
    if (r > n) return -1;
    return (HS[r] - HS[l] + MOD) % MOD;
  }
  int getHash(string& T) {
    if (T.size() > n) return -1;
    int m = T.size();
    int ret = 0;

    for (int i = 0; i < m; ++i) {
      ret += mp[m-i-1] * (T[i] - '0') % MOD;
      ret %= MOD;
    }

    return ret;
  }

  bool isSubstr(string& T) {
    int m = T.size();
    if (m > n) return false;

    int ht = getHash(T);
    vector<int> u;

    for (int i = n - m; i >= 0; --i) {
      int hs = getHash(i, i + m);
      if (hs == ht) u.push_back(i);

      ht *= b;
      ht %= MOD;
    }

    for (int i = 0; i < u.size(); ++i) {
      cout << u[u.size() - i - 1] << endl;
    }

    return false;
  }
};

template<class T> using pq = priority_queue<T>;
template<class T> using pqg = priority_queue<T, vector<T>, greater<T>>;

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

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

  cout << ans << endl;
  return 0;
}