hhh

#include<iostream>
using namespace std;
int main(){
int n;
cin>>n;
int a[200001];
a[1]=a[5]=a[11]=1;
for(int i=1;i<=n;i++){
if(i5||i1||i==11){
a[i]=1;
}
else if(i<5)a[i]=i;
else if(i>5&&i<=10)a[i]=min(a[i-1]+1,a[i-5]+1);
else a[i]=min(a[i-1]+1,min(a[i-5]+1,a[i-11]+1));
}
cout<<a[n];

return 0;

}