#include <iostream> #include <cstdio> #include <cstdlib> #include <cmath> #include <climits> #include <cfloat> #include <utility> #include <memory> #include <functional> #include <deque> #include <cctype> #include <numeric> #include <ctime> #include <bitset> #include <cctype> #include <vector> #include <map> #include <set> #include <stack> #include <queue> #include <cstring> #include <string> #include <sstream> #include <algorithm> #include <iomanip> using namespace std; //define #define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl; #define dump(x) cerr << #x << " = " << (x) << endl; #define INF (INT_MAX/2) #define PI (2*acos(0.0)) #define EPS (1e-8) #define REP(i,a,b) for(int i=(a); i<(b);++i) #define rep(i,n) REP(i,0,n) typedef long long ll; typedef unsigned long long ull; typedef pair<int, int> pii; typedef pair<ll, ll> pll; typedef vector<int> vint; typedef vector<vector<int> > vvint; typedef vector<ll> vll; typedef vector<vector<ll> > vvll; int dx[8] = {0, 1, 0, -1, 1, -1, 1, -1}; int dy[8] = {1, 0, -1, 0, 1, -1, -1, 1}; int main(void){ ios_base::sync_with_stdio(0); ull N; cin >> N; cout << 2 * ((N / 5) + (N / 3)) << endl; return 0; }