#include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; using vl = vector<ll>; using vd = vector<ld>; using vs = vector<string>; using vb = vector<bool>; using vvl = vector<vector<ll>>; using vvd = vector<vector<ld>>; using vvs = vector<vector<string>>; using vvb = vector<vector<bool>>; using pll = pair<ll, ll>; constexpr ll mod= 1e9 + 7; #define ALL(x) (x).begin(), (x).end() #define REP(i, n) for(ll(i)= 0; (i) < (n); (i)++) #define REPS(i, n) for(ll(i)= 1; (i) <= (n); (i)++) #define RREP(i, n) for(ll(i)= (n - 1); (i) >= 0; (i)--) #define RREPS(i, n) for(ll(i)= (n); (i) > 0; (i)--) #define pb push_back #define eb emplace_back #define mp make_pair #define fi first #define se second #define UNIQUE(v) v.erase(unique(ALL(v)), v.end()) #define YES(n) ((n) ? "YES" : "NO") #define Yes(n) ((n) ? "Yes" : "No") #define yes(n) ((n) ? "yes" : "no") template <class T> inline void chmin(T& a, T b) { if(a > b) { a= b; } } template <class T> inline void chmax(T& a, T b) { if(a < b) { a= b; } } signed main() { cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(12); ll N; cin >> N; ll ans= 0; for(int i= 0; i < N + 1; i++) { for(int l= i; l < N + 1; l++) { if((N - i * 2 - l * 5) % 3 == 0 && N - i * 2 - l * 5 >= 0) ans++; } } cout << ans << "\n"; }