#include using namespace std; typedef long long ll; #define REP(i,n) for(int i=0; i #define VLL vector #define VVI vector> #define VVLL vector> #define VC vector #define VS vector #define VVC vector> #define fore(i,a) for(auto &i:a) typedef pair P; template bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; } template bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; } const int INF = 2147483647; const ll INFL = 9223372036854775807; const ll mod = 1000000007; int main() { ll n; cin >> n; ll ans = 0; ans += n / 15 * 16; FOR(i, 1, n % 15 + 1) { if (i % 3 == 0)ans += 2; else if (i % 5 == 0)ans += 2; } cout << ans << endl; return 0; }