#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<n;i++)
static const ll mod=1000000007;
#define int long long

signed main(void) {
  int n;
  cin>>n;
  int cnt=0;
  cnt+=(n/15)*16;
  n%=15;
  for(int i=1;i<=n;i++){
      if(i%15==0) cnt+=4;
      else if(i%5==0||i%3==0) cnt+=2;
  }
  cout<<cnt<<endl;
  return 0;
}